Revan all the way.
Master of light side, master of the dark side, he saved the republic, he as a sith lord created the rule of two, as a jedi was 4000 years ahead saying the jedi should have a family (just like new jedi order) He only lost duels in which he was betrayed. He was able to figth Emperor after being captive for 3 years. We dont know if he really died. We know that he was the heart of the force.