Soundwave on 08 October 2009
The Wii simply has better games.
There's nothing on the PSP that touches Super Mario Galaxy, Zelda: Twilight Princess, Metroid Prime Trilogy, or Resident Evil 4 even if all you want to play are core games.
Wii is also great for whenever you have friends or family over ... the PSP .... not so much. And the Virtual Console is great for retro gaming.
The only reason to get a PSP would be if you need a portable gaming device because you spend a lot of time on the road and have a lot of time to burn, but the quality of software is a fair step down from the Wii IMO.
