As of right now my most fun goes like this with there perspective reasons.
360- graphics, online play (to me the online play can't be more fun)
Wii- new way to play new games and older ported games.
PS3- Its playstation
For the Future i see it like this for me
PS3- More space for more depth in games, Home, and Future Psp Functionalty
360-(online play is still smooth and real fun)
Wii- if things stay the same then wii will be in 3rd for me