I'd have to give this to Exar and Ulic. They were master and apprentice, knew eachother better than anyone, and were arguably the most powerful Master/Apprentice combination ever, save for Ragnos and Hord. Now, they aren't miles ahead of the other team, but I could safely say that Exar could take Revan after a good fight, and that Qel-Droma could kill the Exile in less time then it would take Exar to kill Revan, allowing Master and Apprentice to bring down Revan. Their positions could also be switched; I believe Qel-Droma could hold Revan, while Kun manhandled The Exile. Revan would eventually beat Ulic, but not before he was slain by their joined forces. Nice teams by the way, although it would be a little bit more even with Malak or someone instead. But good thread.
I think Exar is more powerful then Revan but I don't think he would win in a fight, not because he's a bad fighter but just because I think Revan is better. Now the Exile is not bad either, he could surely hold of Ulic for quite some time. Maybe long enough for Revan to defeat Exar.
Still I don't think they would win. Ulic is great too, and he could probably beat the Exile before Revan beats Exar or vice versa.