360: Easy to argue a ps3 is better if you have a gaming pc since all you are missing out on is halo/gears/forza, but if you don't have a gaming pc I much prefer the 360/PC exclusive library to the PS3's exclusive library.
3DS: Was going to go with DSlite for gba compatibility but heck most gba games are probably in the nintendo store.
Wii: All my favorite gamecube games and the couple of brilliant wii games. Can download previous gen games nintendo games.
PS3: Was going to go with the ps1 since my favorite sony exclusives were on that system but most of them are probably on psn.
If we are ignoring backwards compatibility and just picking the consoles most of our favorite games are on.
Gamecube
xbox 360
GBA
PS1







