Xbox 360 is the best. The reason being is because it is cheaper than the PS3, and is almost just as good as it minus the backward combatability.
I thought the wii would be pretty good, but it really is just alright. It is a lot cheaper though. The problem is, everything on the wii is more efficient using on a computer instead. Especially the photos, messages, and internet.
The only thing it is really good for is the games, which I think are more fun with a controller than a remote personally. Yes, some games are kinda fun with the sensor, but otherwise the sensor will be like a button instead of full control of the object.
Btw, I wanted to vote, but I accidentally clicked null vote >_>