Vitiate.
However I will note Revan's performance would have been much greater if the throne room was not 120 feet in length. A closer distance battle would give Revan *much* greater chances.
__________________ "There is only Revan. Only he can shape this galaxy as it is meant to be shaped."
This bothers me. Revan would have been dozens of feet away from Vitiate, *maybe* even the full 120 feet after Vitiate threw him back the first time.
In normal duels, contestant distances are much shorter, and Vitiate would rarely have the opportunity to unleash a FS attack on Revan again.
__________________ "There is only Revan. Only he can shape this galaxy as it is meant to be shaped."
I'm not sure if he would be so easily overwhelmed outside of a Dark Side Nexus, and were the distance between them smaller he may have been able to interrupt it.
Vitiate still wins, despite this though. He's canonically ever growing stronger, and there's a 300 year gap since Revan faced him.