Darth Bane versus Darth Sidious!

Sith'ari Versus The Greatest Sith Ever!
Neutral setting, both are at their peaks, anything goes!
Oh, and only using in-saga evidence.

D'abord, I don't believe Bane has been a confirmed Sith'Ari.

Deux, Sidious has been proven to be Bane's better.

I knew this was coming, and look, I'm closing it because I know this is going to lead NOWHERE.

Sidious wins. Want to know why? You're limiting our means of arguing power to 'in-saga only.' Well, Darth Bane wasn't in the saga, was he? In all seriousness, you're saying 'I know Sidious is better, but I'll make sure that they can't use DE!' and so on.

So, no.