Well where I'm at in the manga... I think Sasuke would win cause he has far greater range and versatility of Jutsu than poor Naruto. Of Course if Naruto achieved "five tail" or higher of Kyubi that would be another story entirely...

I think Naruto has more potential than Sasuke though. Lately, I get the feeling that Sasuke has reached a limitation to his power and would now need to forge his own path in order to grow stronger. Naruto has always had to look to himself to get better and Kyubi gives him enough power to surpass the former Kages (He's already achieved something the Fourth couldn't even do).