Simply because of vader's condition Reevan would win, as someone said before if it was against Anakin, then it would be a little party with Anakin tearing Revan piece by piece.
Also Anakin is the Force user with the most potential, but he severly underutilizes it (he never completed his trainning as a Jedi) and afterwads he was weak due to his injuries. Also I think he would train less afterwards since there was no real threat to him (no other force user around except Sidious).
According to Lucas Luke Skywalker is the most powerful Jedi ever.