Knightfall Vader vs Prime Mace Windu

Would Mace's Vaapad allow him to win this?

Vader likely

Vader still

I'd lean Vader by a slight margin. RotS video game did a decent portrayal of this fight.

Vader

Vader.

Vader.

This fight pretty much boils down to two things: 

1. Could KFV disarm Palps

2. Would Mace be amped by KFV's extreme Darkside energy 

If yes to 1 but no to 2 - KFV 

If yes to 2 but no to 1 - Mace 

All in all, I believe in the latter scenario, but, I cannot ignore the fact that the official RotS game (which was made by LucasArts & used delete/unused/cut film material) had Anakin beat Mace in a long grueling what-if fight. 

Final Verdict: Anakin (begrudgingly)

Vader

Windu. As to the question of Mace drawing on opponents Darkside I it see like emotions being contagious in general. This isn’t unique to Mace Bane and Maul also drew on external anger and let it fuel their own. It’s easier to be angry or happy when others in the room is.

I also don’t think the loop was one sided. I see it more like both Sidious and Windu continuously adding fuel to the fire drawing on each other’s excitement and augmenting their own until it reached the point of infinity.

Vader. Against an opponent that can will himself to kill you, there’s nothing Vaapad can do other than stall

Mace.