Its really hard to discuss this without spoiling the final 2 chapters of sw.
Power wise, beyond that fact game mechanics limit sw's from using the more flashy force powers, it is that as the warrior they put their skills inward instead of outward. You also need to remember the warrior is supposed to come from a lineage of sith where they have been trained since birth to be sith, while the si until recently was a slave meaning the sw would be inherently stronger. Not to mention that since the sw is more about the direct aproach and their focus tends to be on the war at hand instead of searching for lost junk that may or may not help .
Quite honestly the more you go in the sw story I found it is evident who is the true power in the sw story line.
Yep and the SW class quest ending leaves it in no doubt who is superior.