Wii is superior.
But between the two, 360 gets my vote. Right now, the PS3 is a huge, expensive thing with maybe three good games for it. In the future, the system's getting a few more good games, but the game library won't warrant the large price for quite a while, just like the PS2. Maybe in a few years it'll be something good to buy, but right now, I'd rather save my money for Wii games and college. It seems unlike a lot of people, I don't have money to throw away on a giant paperweight.