You know, I'm staring to realize that the toughest Jedi/force user in the series is... Obi Wan Kenobi. I mean, Palpatine, Yoda and maybe Dooku are probably in the next tier up, but looking just at win/loss, Kenobi has the best resume. He beat Maul. He beat Grevious. He beat Anakin, and only lost the old timer's league rematch because he threw the fight. He beat Ventress. And he beat a variety of bugs and monsters and stuff in both live action and TCW.
The only one who really handed him an L was Dooku. I mean, sure, he'd probably be in trouble against Palpatine or Yoda, and Mace seems to be crazy powerful in TCW too. But the fact is, those fights never happened, and none of them got into the tangles Kenobi routinely did (and basically always won). Obi Wan gets knocked around a lot, but he always comes out on top.