For this one I'd actually say Revan would win, and not just because biased opinions.
Master Windu was said to not only to be a great saber wielder, but also a force user who could tap into the dark abilities without falling to the darkside. He was a general during the clone wars, and has been in many battles, although mostly stood on the sidelines and simply plotted.
Darth Revan was also a powerful saber wielder, known for his skills throughout his Jedi training under his multiple masters. Revan had tapped both into the light and dark sides of the force, learning well from them. After his memory regained, he became somewhat of a grey jedi, fighting for what he believes to be right. This means he can tap into both his full powered light and dark sides using their abilities at their strongest at will. This can be backed up by Darth Malak's response on how Revan was even stronger than the time to when he still had his memories. He was also a general of the Republic during the Mandalorian Wars and the Dark Lord during the first half of the Jedi Civil War. Aside from him being a general, he was known to be "the one in charge", and planned every strategy against the Mandalorians. He would even join the battles he was enforcing, unlike Windu who would observe the battle from afar until he was needed. This I would say gives Revan more battle and strategic experience.
Seeing as to how Revan was trained in many saber styles from multiple masters all of which acknowledged his amazing skill, how Revan knows how to tap into the full potential of both the light and dark sides of the force, and how Revan was a great warrior and strategist during two intense wars giving him a ton of experience, I'd say Revan is the winner. Also Windu sucks. So there's that.
There once was a member of this land,
A humerous posting he had planned.
But when he posted,
By mods he was toasted,
And he had found himself banned.
