GameCube for me. It had most of the big 3D Zelda games to a capacity (wind waker, twilight princess, OoT + Master Quest. AND the Zelda collection which had OoT, Majoras Mask, a demo for Windwaker and Zelda I and II).
Double Dash to this day is a very under-appreciated history of Mario kart and Melee was the best smash bros up until Ultimate.
Mario Sunshine was ok, not my favorite but it was ok. But for Mario we also got paper Mario the 1000 year door, luigi’s mansion and Mario party 4 (the last GOOD Mario party)
after that it’s kind of a tie between switch and n64. The n64 if not for nostalgia but OoT/MM and SM64 defined the start of the 3D era. The switch however has become what I consider the culmination of Nintendo’s best.