Vader, no contest. When it comes to lightsaber combat, while Vader was less mobile he makes up with it in strength, and defense. His style was a modified version of Djem So, the way he designed was to completely balance defense and offense. His arms would swing much harder than a normal humans, one good two handed strike and revan would be underneath vader trying to hold off the onslaught. Lightsaber advantage is Vader.
Strategy, both were generals and most were pretty successful in their missions. This is where they tie.
Force: While Revan had a greater understanding, Vader had better command. You don't see Revan force choking people from across the ship, force edge would be vader.
Feats: Revan's main feat was destroying the star forge, while Vader's was hunting down the remaining jedi order, and leading the assault on the jedi temple. Vader destroyed the next generation of jedi, while revans feat was great, Vader's was more effective in ending the enemy.
Vader wins this match, sorry Revan Fanboys but he is not all you crack him up to be.