If any class were the "best" in that generality, it would need to be nerfed.
In a properly balanced game, there are no bad classes, but only bad players. Sometimes the density of competent players varies by class, which can create the illusion that some classes are better than others.
I understand the whole balance class thing and I realized I didn't fraise my question as good as I should have. What I meant was which class is the most fun to play and all around balanced in every way. Able to take on any sit but isn't OP like druids in WOW.
Honestly the classes are all equal in my opinion. You can never have a "best" class in this game which is pretty nice. Although my favorite would probably be myth, just because of the minions though. Minotaur minion owns :-P
I agree with most everyone else that right now (at least to a newish person like myself) that the game seems pretty well-balanced and that the best class is the one that best fits your play-style.
I personally found the little quiz that they give you at the beginning to be pretty accurate as far as it figuring out my play-style. In other games I normally like to play the 'tank' type, and the quiz said I should be an Ice wizard.
I think also, more than just your primary class, picking a good complementary secondary class/other skills and equipment also goes a long way toward refining your play-style and turning a good wizard into a great one.
:-) Also most importantly the best wizard no matter what anyone else says is the one that you are having the most fun playing.