not voting on this one but i have to say that after many many readings through the RC books, I think that at the current point in time for Vau and Skirata, they wouldn't fight unless there was a REALLY REALLY good reason for it. They've had their differences but they've pretty much reached an understanding.
As it is if they did get into a fight it all depends on the reason behind it, where they are, if they are in armor or not and a whole lot of other things that can effect a fight.
If it was just to brawl because they were just ticked off, i think Kal would win. He goes complete berserker mode. Vau is more calculated.
Just my opinion at least.
take care all,