I give the edge to Sidious. Like Yoda says in the novelization, the Jedi failed to change. The Sith not only changed, but evolved warfare completely by studying the force and the Jedi. What used to defeat them just doesn’t work any more. I think if you were to categorize individual strengths, you’d find Yoda would win in terms of dueling and control. But overall, Sidious takes it. I mean, he took the whole cake already.