i just watched avatar and i would go for aang for the following reasons (imo):
- he's showed more skills in taijutsu than naruto has ever done
- he can easily dodge anything thrown at him with his airbending acrobatics
- his powers are only limited to fatigue
- he possesses three more elements
- his avatar state when fighting the phoenix king is the ultimate defense, he's bubble was good but what was even better was when he moved canyons to defend
- on the ground, he can feel/predict his opponents movements
the only downside he has over naruto is his offensive power, because he fights primarily for defense and has no killing intents, except when in avatar state where he is willing to kill but still he didn't show a lot of offensive stuffs...
and since we're on a naruto site, i guess most people would vote naruto...