I doubt the Wii library will hold a candle to the PS2 library when it's all said and done, but few consoles have that many great games and even when it falls short it should still have an impressive lineup. It is about preference too, but I see the wii severely lacking in many genres I care about, but that is true of every current gen console. In terms of number of quality exclusives, range of titles, range within each genre, and volume of quality titles available the ps2 will win.
Kind of off topic, but Virtual console is a good idea though it has its share of flaws, and I'd love a handheld built around the idea of the VC. They just need a much, much bigger library to offer to make me interested in it. It's a dealbreaker if some of my favorite SNES games of all time won't ever be available for the service.
Demon's Souls Official Thread | Currently playing: Left 4 Dead 2, LittleBigPlanet 2, Magicka







