Never had a preference. I find some things work better in English; others in Japanese. There are good Eng VAs and there are bad JP VAs. It's a mixed bag. One's not unequivocally better than the other, and the Naruto dub isn't an exception or anything. It's pretty average from what I've heard of it, though I haven't seen any of the newer stuff. Not amazing, not terrible. Could take it or leave it. Only reason to favor the Japanese VAs is impatience, but that's sort of a non-issue in this case, sooooooo~whatever.
it doesn't matter to me either way i don't bother thinking about how the voices sound when i play im either to busy watching my opponent and learning how they play and coming up w/ strategies or just not thinking about anything at all and reacting to what happens in battles as fast as possible in the most effective way
that is just me though
funny thing is one would think that strategy and planning would work out better in battle but it usually doesn't thinking on the fly and reacting to any situation to the best of your abilities usually works much better for me anyway
anyway got a bit side tracked there either or is fine