Wii for parties and when friends are over and PS3 for everything else.
The only thing that the Wii really has going for itself are its epic titles (Zelda, Metroid, and Mario, for example). And even though the party games are fun as hell, they're terribly boring by yourself (even if you are unlocking levels).
The PS3 has many more advantageous qualities to it than the Wii does. For one, I can play all of my PSone and PS2 games on it seamlessly; Two, the graphics are absolutely phenomenal (especially on a great TV -- I got a 61" DLP); Three, I don't even use the DVD player on the home theater system -- the upscaling on the PS3 is brilliant.
I can't really talk smack about the 360 because I have only played a couple of games on it. Graphics on the 360 look decent. I just can't stand the bulk of the controller.
