Well, I think DBZ is better, and being as that is part of the Dragonball Trilogy. I go with Dragonball, Naruto is great and all, but DBZ.. it just means more to me, plus, personally, I think they dubbed it better than Naruto, even though they cut out ALOT of DBZ, the voices where just way better imo. And plus, the art, they are both great, but I think Akira has the better art in DB/DBZ, rather than Masashi's Naruto. And the storyline is better, I mean, you literally see Goku go through the series from a child up to and adult and so on. More like a life story thing and such, which is better imo.
Okay, that's all I have to say.