Avatar has a better story, it's funnier overall, the writing and dialog are better, the pacing is better, the overall cast is better. As a series Avatar gets better as it goes along and is at it's peak when it ends.I think it's totally different than Naruto Jutsu.
You think its better?
DBZ is entertaining but let's not act like dude wasn't making it up as he went along and the quality is all over the place the Majin Buu saga in-particular. The best DBZ had to offer was the Frieza and Cell sagas. As far as I'm concerned the rest of it can go in the trash bin. If DBZ was just those two i'd give it the nod over Avatar. As a complete work I can't.