Arcann possessed immense physical strength, as a child capable of taking on and defeating Zakuul Knights in melee combat, and in his prime easily overpowered Sith Warriors of the resurgent Sith Empire, and completely dominated the Sith Lord Darth Atroxa - who led the Sith defense of Korriban. He also demonstrated physical superiority over the Outlander, and in a fit of rage overpowered and killed his brother in seconds.

In terms of endurance and pain resistance, Arcann survived being caught in an explosion from an airstrike that caused irreparable damage to his arm and serious burns to his face, enduring the installment of metal prosthetics in the field and while remaining conscious.

Finally Arcann possessed considerable talent in the art of Force concealment, hiding his presence from the Outlander despite being mere meters in front of him, and later catching him off-guard with a surprise attack.

At a young age Kyp demonstrated considerable strength and stamina, deflecting laser cannon fire from a freighter for several minutes, and also exceptional endurance and pain resistance, surviving crushing his legs, arms and rib-cage in order to fit into a tiny message cylinder, before being briefly exposed to the vacuum of space. And in his prime, he displayed the Force augmentative abilities to spar evenly with a young Jaina.

Malgus possessed incredible and dominating physical abilty, during the Sacking of Coruscant easily overpowering and slaughtering several Jedi, and before his was capable of launching the likes of Ven Zallow and Aryn Leneer across 10 meters with his physical blows, the latter of whom he drove to her knees with his strength, in particular he struck an armored Lord Adraas with sufficient force to break his ribs and split a column he was sent flying into. He later collapsed Adraas' trachea with his grip.

Malgus also demonstrated considerable speed, slaughtering a group of 5 soldiers in less than 5 seconds.

Finally Malgus has demonstrated exceptional endurance, well before his prime withstanding a direct hit from a missile, and a concussion grenade at point blank range, before being smashed into a cliff face and hit with a telekinetic blast that destroyed it. Despite this, and despite being later buried under tons of duracrete and steel, Malgus went on to engage and capably defeat a pair of Jedi.

Cade possessed incredible healing abilities, claimed to be greater than Luke Skywalker had ever known, with an innate talent in dark transfer he was able to heal his own injuries almost instantly, bring others back from the brink of death, and purging himself and others of fatal poisons or deadly plagues like the Rakghoul virus.

He had potent Force augmentative abilities, capable of evading omni-directional fire at point blank range without injury, and physically dominating and launching several meters the likes of Darth Stryfe & Nihl with his kicks. He also proved fast enough to retrieve his weapon and impale Darth Krayt before the Krayt could react.

His physical ability was such that he was able to slaughter dozens of Sith troopers and warriors in combat. He also defeated Nihl and Talon before his prime, impaling Talon before she could even strike, and after a protracted duel severing Nihl's arm. And held his own against a Krayt, with enough pressure to leave the latter drained.

He also possessed exceptional physical and mental endurance, capable of enduring the embrace of pain and overcoming Darth Krayt's potent illusions, as well as Darth Maladi's and Karness Muur's corruptive powers.

Finally he was a master of Force concealment, capable of retreating from the Force so no Sith could find him.

Arcann was able to have fully fledged telepathic conversations with his twin brother, Thexan.

Kyp is a piece o **** with no feats in Sense.

Malgus was able to sense the presence of a Jedi concealing their presence in the Force, the presence of mines beneath the path before him and the death of his ally Venemal, along with thousands life forms from orbit.

Cade was able to use his mastery over Dark Transfer in unison with Shatterpoint, allowing him to perceive in his subjects the weak and damaged points in their body, allowing him to heal or tear them apart. In particular he was able to see "every flaw" in the Muur Talisman, and used this insight to shatter it into pieces.

He was also able to sense the presence of others were others, like the Imperial Knight Draco, could not.

Arcann possessed immense telekinetic abilities, capable of telekinetically dominating the Outlander - plastering him against a wall, disarming him with a push, ragdolling him repeatedly, before telekinetically pulling him on to his lightsaber. Arcann was also able to Force grip and seemingly dominated the powerful Heskal. He was also able to prevent a massive pillar that collapsed on him from crushing him, emerging unscathed.

Arcann was also masterful in Force lightning, a blast of which destroyed HK-55 beyond repair and was seemingly life threatening to the Outlander. He was also able to unleash lightning in blasts and lightning strikes.

In terms of Force defenses, he was described as having an almost "unbeatable defense" and demonstrated as such when shrugging off the Outlander's telekinetic attacks, defending himself against the explosion of dark side energy resultant of Valkorion's death, that rendered the Outlander unconscious, and later withstanding for almost a minute a vast Force storm conjured by Valkorion that was large and powerful enough to kill the pilots of passing ships, something that only overwhelmed him via its telekinetic force.

Kyp possessed profound telekinetic ability. At a young age incinerating living tissue, reducing a pair of rats to bones with a burst of power. In his prime he was capable of manipulating proton torpedoes and launched a freighter at high speeds in space. He was also capable of manipulating artificial black holes created by dovin basals, that were dense enough to consume almost anything they came into contact with. Kyp was also capable of fine manipulation, animating a shower of nuts and bolts to attack in a swarm at missile like speeds. Kyp was highly capable at breaking telekinetic barriers, easy ragdolling Corran Horn with a flick of his wrist.

In terms of mental manipulation Kyp possessed considerable talent, capable of projecting memories into the minds of non-Force users while erasing others.

Finally he was masterful in Alter Enviroment, calling down a lightning bolt that instantly killed a Sith leviathan.

Malgus was capable of blasting multiple non-Force users into walls with killing force. His Force pushes before his prime blowing away the likes of Leneer away and incapacitating lesser Jedi, later in his prime he was capable of telekinetically dominating the likes of the Hero of Tython, Barsenthor, Nox, and Wrath with his Force pushes.

He could also generate powerful Force waves, well before his prime and when weakened blowing away tons of rubble, and later in a burst of anger he blew doors of their mounts and sent a crowd of bodies flying in all directions. He could also generate a Force scream that buckled a transparisteel viewport, overloaded the fuel cells a passing wave of fighters and leaving the ears of his crew bleeding.

Malgus was also capable of easily lifting and hurling objects, such as large statues and a massive boulder. And was able to prevent tonnes of duracrete and steel that collapsed on him from crushing him.

He also capable of easily breaking the barriers of Jedi, repeatedly dispatching Jedi with Force grips.

Malgus was also masterful in Force lightning. Capable of blasting holes in flesh, and with a single discharge killing two armoured Padawans instantly and Jedi Knight after a few moments of agony. He was later casually capable of blowing Aryn Leneer away with her Force lightning, rendering her unconscious, and disarming Lord Adraas. Later in his prime his lightning brought the likes of Nox, the HoT, Barsenthor and Wrath to their knees.

Finally Malgus mastered the Force maelstrom, a telekinetic Force lightning storm that was described as a precursor to the much more powerful Force storm, one of the most powerful Force abilities ever recorded.

Cade possessed immense telekinetic power, capable of lifting and dropping a huge section of a ruined starship on Darth Talon, whom he later dominated with telekinesis, slamming her into the floor and ground with Force pushes. He was also able to knock Celeste Morne to the ground despite channeling the power of Karness Muur, and blowing away Imperial Knights and Sith Lords. He also demonstrated refined mastery in telekinesis, buffering Nihl, Talon and Krayt with a storm of thousands of glass shards.

Cade was also capable of killing a Sith trooper commander instantly with Force lightning, overwhelming Darth Maladi with Force illusions (despite herself being a master sorceror) and could control the minds of beasts.

Finally Cade possessed potent Force defenses, shielding himself from the self destruction of Darth Maladi's lab and emerging without injury, despite being at the center of the explosion. And was also able to defend himself against the powers of Darth Krayt, who failed to keep him at bay with his telekinesis and Force lightning.

Arcann was capable of overpowering Sith Warriors, and the powerful Sith Lord, Darth Atroxa:

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He demonstrated a physical advantage over the Outlander, pushing him onto of the back foot:

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He quickly and easily overpowered his presumably powerful brother (as a twin), Thexan, although it should be noted that Thexan was caught of guard and was not prepared to fight him:

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vs. Kyp Durron

In comparison Kyp at age 19, Kyp capably deflected blaster fire from the twin laser cannons on a light freighter:

This is an impressive strength feat, but frankly I would not say at all beyond Arcann considering the tremendous strength he has demonstrated above. Kyp however has simply never demonstrated the kind of overpowering physical ability Arcann has, and instead at age 18, when Kyp was 34, Jaina kept up with him in all respects.

vs. Darth Malgus

In regards to strength Malgus has demonstrated comparable ability to Arcann, violently dominating and quickly dispatching several Jedi Knights in combat during his attack on the Jedi Temple:

And in his prime, Malgus was able to take on four of the galaxy's most powerful champions, including the likes of the Hero of Tython and Emperor's Wrath, in lightsaber combat, who later went on to become the Outlander, and who too would presumably be unable to defeat Malgus alone.

Malgus also decimated powerful warriors like Adraas, and well before his prime an exhausted Darach. And with ten years of growth it is likely that he'd dispatch the like with even greater ease, though it is also important to account for the fact that Arcann himself has had five years to expand his own abilities, which in terms of the dark side, were very formative at the time of that showing. In this respect they establish rough parity.

vs. Cade Skywalker

Much like Arcann and Malgus, Cade has easily dispatched multiple high profile warriors in combat, in particular we see him slaughtering dozens of Sith troopers and Sith who appear to be no match for him:

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And he stacks up to Arcann in the respect that (I believe before he completed his training/reached his prime) he one-shotted Darth Talon before she could even strike:

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Whose feats would suggest her more powerful than Atroxa, and it seems likely he if can dominate her speed, she'd be no match for his strength either, and that Cade would be able to disarm her in a similar manner.

Though factoring in Arcann's 5 year growth in power and in seems unlikely Talon could stand against him either.

Finally Cade can be considered arguably comparable to blitzing Thexan when caught of guard by surprising and killing Darth Krayt, an individual considerably more powerful, with a single attack:

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Which I think does enough to demonstrate that Cade can prove lethal when even supremely powerful Force users lower there guard. Though unlike Krayt, Thexan had the advantage of raising his blade to defend himself.

Arcann recovered from being caught in an explosion which burnt his face and damaged his arm. Arcann had his arm amputated and a mask drilled onto his face in the field, presumably without any anesthetic:

vs. Kyp Durron

In comparison, when he was only 18, Kyp was able to crush his legs, arms and rib cage, entering a hibernation trance to surviving the vacuum of space for a short period without any life support:

This is a very impressive feat of endurance, especially considering it was well before his adult prime. I think it more than compares to recovering from the injuries Arcann sustained on Korriban.

vs. Darth Malgus

In comparison, well before his prime we have Malgus enduring a missile to the face:

Being blown up by a concussion grenade at point blank range.

Then being slammed against a cliff face and hit with a blast sufficient to blow said cliff face apart:

More than suggests he could endure these level of injuries, noting that like Arcann, he later resumed fighting and killed several Jedi with renewed strength, so altogether he more than compares here.

vs. Cade Skywalker

In terms of physical endurance, Cade was able to endure the Embrace of Pain:

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Which though impressive, I wouldn't say is the kind of pain Arcann is like to succumb to, nonetheless Cade's mastery over Dark Transfer, by which he was able to heal his own injuries with ease and bring others from the brink of death, elevated his endurance capabilities to higher plateaus.

For example he was able to purge himself (and another) of the Rakghoul virus:

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His ability to defeat such a potent disease that even Sith Lords had succumbed to, he was also able to purge others of lethal toxins, and the Vongspawn virus. Altogether demonstrating more refined power and mastery when it comes to enduring and overcoming bodily injury and corruption, on a level Arcann has not reached.

Cade's abilities in mental endurance also more than stack up with Arcann's showings.

In particular overcoming the illusions of Darth Krayt, and resisting dark side corruption:

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The level of mental resilience and more importantly self mastery he demonstrates being highly impressive. It being worth noting that Cade was also able to overcome Muur's attempts to corrupt him with his influence, and altogether possess him as he was able to possess others when the Muur Talisman became attached:

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Arcann hid his presence from the Outlander despite being mere meters away:

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And was later able to sneak up on the Outlander and attack him unawares:

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vs Cade Skywalker

Cade is the only individual who has feats to compare in this category and they are quite impressive, namely his ability to withdraw from the Force so his presence couldn't be sensed by the Sith:

“I withdrew from the Force so the Sith couldn’t find me. I went into deep meditation to save oxygen.”

--Taken from Star Wars: Legacy 6: Broken

Which I would say is quite impressive considering among the Sith included Darth Krayt, who himself has very impressive Sense abilities, and in fact was able to sense Cade's use of the Force from light years away. That said I wouldn't give Cade an edge, only parity, seeing as Arcann was standing in plain sight and still invisible.