Definitely Luke. if you haven't looked in more to what he does, then you won't understand. Yoda was the greatest teacher of Jedi, but like all the other grandmasters of the time, couldn't see Sidious right under his nose. Windu didn't fight Sidious alone (got several Veteran Jedi killed) and dooming of all, he didn't see the conflict in Anakin. Windu completely ignored the battle for Anakin which was why Sidious was able to beat Windu.