Well, we don't really know how strong RotS Vader was at his peak. Or, to be more specific, we don't know how crooked Anakin's mental state was prior to Mustafar, where we know it was dogshit.
Registered: Aug 2014
Location: The balance of the Force
Vader may have grown in power, mastery, knowledge and technique. But I have always had the opinion that Vader before Mustafar was the closest he ever got to Sidious. His fighting style, the wild overwhelming juggernaut that he'd become by that point was just unmatched. That Chosen One potential was really starting to pick up the slack in terms of his augmentation and focus.
The Vader style of fighting that stomped Dooku and Drallig is just more effective in combat, gotta go with him.
__________________
Within your furnace heart, you burn in your own flame. This is how it feels to be Anakin Skywalker.
Yeah. I mean, he literally treated the Battlemaster of the jedi order like he was a freaking youngling. The same battlemaster that Dooku warned Grevious to watch out for.
__________________ ”You presume limits to my power. There are none.”
Somebody did raise an argument about how Cin was also fighting clones at the time. Can't remember what that argument was, or who raised it (I think it was Sas, though).
pre Mustafar Vader stomps his older self, like somebody just said this was the closest he'd ever come to realizing his potential and had he beaten Kenobi he would have gone on to kill the Emperor shortly after.