I would put Freedon Nadd among the possible sith stronger than Vader. He was said to be stronger than Ragnos, someone that both Kressh and Sadow respected and feared
Exar Kun, Marka Ragnos, Naga Sadow, Horak-Mul, Ludo Kressh, my dog, Ajunta Pall, Sorzus Syn, Darth Traya(I still believe she's 2000 years old), Ulic Qel-Droma and JKBart.
Tbh I don't know the source of that statement because I read it for the first time in this forum in a thread a few months ago. Aniway, the line more or less said: " Nadd trained with Ragnos' spirit untill he became strong enough to defeat him, then in the following years he kept practicing in order to become more and more strong"
Aside from Vitiate, and Kun on a good day, none of them. I'm sure they where powerful enough in their own times, but they've got nothing to support them but legends by followers who perceive anything they do as godly, though I'm sure this thread will continue to prove the obvious that KMC cares more about opinions than actual facts.
This tbh. Exar Kun could win and Vitiate probably does, but arguments for other sith tend to be based on vague hype rather than any combo of feats or solid accolades.
I mean, it's not just a matter of exposure - if suit Vader has half of his former potential, that's still potential on the level of Sidious, and so by RotJ he should have far surpassed most of the ancients.
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Meh, novel Vitiate+ absolutely murderstomps Vader without acknowledging his existence
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