SNES & Gamecube tied. Too hard to pick between them....
SNES has so many amazing clasics like Super Mario World, Super Mario All-Stars, Super Mario RPG, Final Fantasy VI ( I don't care if it was released as III, it's VI ), Chrono Trigger, Super Metroid, Kirby Super Star and my all time favorite game EarthBound.
Gamecube was the first console I ever bought myself, and the games, man...Eternal Darkness, Chibi-Robo, Pikmin, the only 2 console Pokemon RPGs, Melee...ah, memories. Still have to finish Pikmin 2....
The Xbox 360 & Xbox One are close to me too....as are the Wii, Wii U, GBA, DS and 3DS. But SNES & GCN are my faves.
_________________
Ore Sanjou!