Super Smash Brothers Meele beats all both. But to stay on topic I'm going to have to say Super Mario Galaxy. Just because imo Brawl destroyed Super Smash Brothers series.
what exactly did you mean? wrong... Mario 64 is the best mario game ever made... I bet you have never played it... SSBB is way better.... in fact, I could pretty much say that's the best wii game for the moment.
As much as i like both games brawl is far better it was just more fun and it never got boring NEVER!!!!!
Super mario galaxy was amazing, sadly super mario galaxy 2 was a screwed game, even though it contained yoshi, the levels were small, you did not get a good chance on exploring and, in the final world they had returned the 3 levels i hated most in super mario galaxy 1, luigi's purple coins, speedy comet beach bowl galaxy and of course bouldergeist the ghosthouse's boss. (== there is one again aaah so I guess i'm going for brawl, some chalenges are hard, but they are all posible, they only require skill, also HAL lab hasen't screwed a sequal yet.