I've never had an SNES (my cousins had one :(), so I would go with the N64 - The Legend of Zelda: Ocarina of Time, Super Mario 64, Mario Kart 64, Crusin' World, Mario Party, Goldeneye 64 - playing all these great games created some special memories for me. The original NES would come in second for me, since I love SM3, SM1, Ghosts and Goblins and Mario Golf Tournament.