Kakashi wins on fanboys/fangirls... xD
Kakashi's tai is definitely stronger, but nin is weaker. Gen? Even.
Frankly, without using the curse mark, Sasuke is only about as powerful as Itachi was when he fought Kakashi. Even with it, he likely can't stand up to Kamui.
In the manga, though, it's a bit different situation.
I'd say it's still a tie, since Kakashi, having no other real option, and Sasuke being the suicidal maniac that he is right now, they'd use Kamui/Amaterasu and either nothing happens or they both get killed...
If that doesn't happen, who knows? Kakashi in part 2 is definitely stronger, after all... He is Kage level as well now. But I voted Sasuke because personally I like him more.
