Tidus plays... Blitzball?
Zidane plays... the most addicting card game ever in a Final Fantasy game?
If they fight, it might be close though. A good Jecht shot (or whatever his final limit break is called) in the face and Zidane is down, but Zidane in Trance is just too powerful.
So with all that said, I think Zidane wins.
Random game thought :
Why is Bionic Commando Rearmed 2 getting so much hate? We finally get a real game and they're not even satisfied... I'm starting to hate the gaming community so f****** much...