yeah dont get the Wii version, it's vastly inferior. the filters are whack compared to the vibrant PS2 version, but most of all, the Wii version HAS NO prologue scene or CREDITS.
so when u beat this amazing game, you'll have no credits to show for it (yes they're important cause there's a little scene after it, the credits themselves are awesome. and of course, having a prologue is better than not having one)
in conclusion: You want the PS2 version.