Hmm...well, once upon a time, I would have proclaimed the SNES the greatest console. However, this was soley due to its library of games...
Games such as Super Mario World, Super Metroid, Super Castlevania IV, Kirby Super Star, The Legend of Zelda: A Link to the Past, Super Mario RPG: Legend of the Seven Stars, Final Fantasy IV, Donkey Kong Country Trilogy, Zombies Ate My Neighbors, F-zero, Gradius 3, super mario kart, Contra 3, ActRaiser, Secret of Mana
all of which appear on the Virtual Console. Along with classics from many other consoles.
So...yeah, with the Wii having digital access to an amazing backlog, full backwards compatability with the gamecube, and a ton of great games, it is my favorite console...even with its mountain of third-party crap doing their best to hide the good stuff