Subs. Hands down. Original japanese VAs are more dramatic, funnier, and fit the mood better. For example, Naruto says "datte bayo" at the end of every sentence, which is cool. But everytime the *dubbed* Naruto says "believe it", I want to shove my fist through the television. Believe THAT.
And the *dubbed* Naruto completely slaughtered Kiba, Gaara and Shikamaru's voices!! Not to mention Edward Elric's from FMA. They suck.
But I have to say, Sasuke and Neji's dubbed voices aren't all that bad. And Alphonse Elric's is cute.
BUT DUBS ARE BETTER ANYWAY.