Wow, this is a tough one. For me its between PS1 and SNES....
I think PS1 just about takes it thanks to its amazing library. MGS1 and FFVII were amazing and the PS1 introduced a lot of other top franchises to gaming (Resident Evil, Tomb Raider, Silent Hill). Super Mario World still has a place in my heart though :P.
But PS1 just about takes it.








