There is no way to equate their full potential. It's pure speculation. RotS Yoda was Yoda at his fullest potential. We have no clue where Revan would be - and Mace was unlikely to be at his absolute pinnacle. And we know that Sidious wasn't close to his full potential as of RotS.
However, I have to assume that the Sith win. DE Sidious (the closest incarnation of Palpatine at his full potential) could likely do this by himself.