Sub. I guess it's partially because it's the version I watched first. But then again, I watched one episode of the dub and..oh god...
I mean, I don't mind naruto's voice..It's just the 'believe it' part that pisses me off. Also I think Sasuke's voice is a tad too deep, and I'm not keen on how they pronounce 'jutsu'. But that's just my opinion. *_*