I have Wii60. My Wii is a buttload more fun than the 360. Metroid Prime 3 is a great game (my first Metroid game), i'm about 8% through it. I only have Madden 08 for 360, and will probably get Halo 3....but I can't see myself getting more than that.
On the other hand, MoH: Heroes will have 32 player online. SSBB will be awesome (and have online, to add more to it). Mario Galaxy? Could be good, but I'm not a big mario fan. If you ask me, he's freaking whipped. Over 20 years and what has he gotten from Peach? Nothing. I require a game with a story (Zelda, Spyro, Metroid). That reminds me, SPYRO FTW (that means For The Wii!) this Winter! Supposedly will have at least a T rating.