Probably the SNES, looking at it from a software perspective, I'm still discovering a good number of great titles for it even today.
For my nostalgia bones, the Gamecube, pretty much the most formative system from the home consoles for me as far as what kind of games I resonate the most with goes.
The Pikmin games, Donkey Kong Jungle Beat, Kirby's Air Ride, Luigi's Mansion, Mario Party, Soul Calibur II, Melee, Double Dash among many more. Also taught me that there isn't a better Paper Mario game than the first one gameplay wise.
Its most important software for me tho, Metroid Prime, Wind Waker, Fire Emblem Path of Radiance and Tales of Symphonia. Pretty much what shaped me the most out of anything else. PoR and Symphonia still being the most perfect games of their genres for me. Recently I also discovered a game that comes close to Symphonia, Baten Kaitos Origins, another gamecube classic.
