Originally posted by Stigma
Well, Plagueis is pretty much = TPM Sidious. It's virtually impossible to top that for someone who's not named Luke, Yoda or Vitiate.
Keep in mind, we know very little of how strong TPM Sidious is except for his training/being stronger than Maul.
He only gets combat feats well into the clone wars.
He shouldn't have grown more skilled, at least; his only duel during that period was with Maul, and perhaps sparring with Dooku.
That being said, he did become more powerful with the death of Plagueis, and over the course of the PT he probably amassed and practiced more DS knowledge and such.
Still, TPM Sidious via power scaling and his showings against Maul should still be above the likes of Caedus and Krayt. Plagueis being supposedly his peer is pretty impressive on his end.
@DMB - Just prior to killing Plagueis, Sidious was his rival (in other words, equal, or give or take a notch). After killing him, his power grew and surpassed Plagueis' entirely.
Anyway, Plagueis wins. His power, knowledge and mastery of the Force all transcend Krayt's, and so do his physical attributes. I wouldn't hand him the skill edge over Krayt, but he doesn't need it to win. Still, it's a good fight.
For DB77 ^^
Plagueis sweeps.
While has only a few feats, most-if not all- of them are impressive.
His speed and strenght feats are above Krayt, imo, and his Durability is at least comparable.
For his raw power and mastery speaks his Midichlorian manipulation, and his unbalancing of the force. Granted, both of them aren´t combat apliccable.
But powerscaling is where Plagueis shines. He is vastly superior to the likes of Bane and Zannah(I suppose you know their feats?) and >/= TPM Sidious. We have no reason to suggest that RotS Sidious >> TPM Sidious- and RotS is the canonically most powerful Sith of all time(IIRC, even EoTPM Sidious is).
For his lightsaber skill speaks that he has beaten Venamis- someone who knew Plagueis form perfectly, and was implied to be Tenebrous (nigh-)equal; who was also >>>>>>>Bane/Zannah.