GameCube or Wii U for sure.
I’m gonna go with GameCube though because I believe it was the best system of that Gen.
Man the games that system had were amazing and it was a little power house for the time.
Metroid prime
Zelda Wind waker
Zelda Twilight princess
Zelda collection
Smash Melee
Mario Sunshine
Eternal darkness
Res 0
Red 1 Remake
Resident evil 4
The system was just a killer but sold like a dud.