system
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human
[Star Wars] Assuming that the Sith are constantly getting stronger, does that mean that Vadar could potentially take on any previous Sith and be victorious?

Not too big on sith lore so sorry if this is wrong but to my knowledge, a sith apprentice has to kill their master to become the master.  So assuming this Vadar should be able to defeat all previous sith? (1v1).
gpt
Vader is much weaker with his equipment. If he wasn't injured and remained able bodied there's a possibility but he was weakened (something Sidious loves) and so was bound to be Palpatine's slave. 

I'd probably also argue that Old Republic Sith as entombed on Korriban are much stronger than Sidious is. Its only with the creation of "rule of two" that the Apprentice would go on to be more powerful than their master. Ajunta Pall, for example, was able to remain as a ghost for Millennia after his death. Darth Nihlus was able to devour planets (something Sidious couldn't even come close to) and Darth Sion was more powerful than Vader and was more damaged than Vader was. He was literally a walking scab.