*Drum roll*
Okay here we go. Two of the most powerful Sith Lords of all time both having accolades claiming they are the strongest in history. In a battle to the death between The Sith Emperor as of his first encounter with the Hero of Tython and Darth Sidious from Dark Times, who will come out victorious?!?
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__________________ "There is only Revan. Only he can shape this galaxy as it is meant to be shaped."
No, he has a real body. He's a pureblood sith. His real body went into slumber after his fight with Revan. That's when he started doing essence transfer into his "voices".
Vitiate stomps because he has telepathy, and you need to have a combination of both light side and dark side to use TK on Vitiate in order to break off his concentration of mind-domination.
__________________ "The power of the dark side is an illness no true Sith would wish to be cured of" -Darth Plagueis
To be completely honest, it is very difficult to actually affect Vitiate with force abilities. Revan's (impressive) TK sent an imp guard who was drawing on vitiate's power just half a step back. The only time Vitiate has been noticeably affected by TK was when Revan went semi-oneness while vitiate didn't have his guard up from directing a telepathic assault, and even then he got right back up.
Sidious wins because he apparently knows every power in existence and that includes ones that were mentioned after that hyperbole quote, and he knows every defense!
I don't remember who ever argued that Sidious knows every force power. Tho I've seen pretty good arguments that Sidious is very knowledgeable based on that quote in the DE sourcebook.
__________________ "The power of the dark side is an illness no true Sith would wish to be cured of" -Darth Plagueis
Yeah, I'd say Sidious is among the few individuals that can stop Vitiate's telepathy without having faced it before, since he already knows the technique used and it's mechanics.