Yoda and the Emperor (either Palpatine or Vitate would work), easily. What a lot of people fail to realize is that Revan really isn't that strong in the Force compared to the likes of Yoda and the two Emperors, and I don't think Vader would be strong enough to carry him through the fight.
Agreded a lot of people over estimate revans force abilities revan isn't as strong as most with the force but he has a lot of knowledge with it being both jedi and Sith. Revan would be better with a saber basically I see a team of of people skilled with Meele vs a team of force focused users. Though in the end vitiate would be the only one left alive.