When I was a kid, my granddad had a Nintendo 64 (we got that N64 for ourselves after he died when I was a teen) and we had a Wii at home, and we had one of those early DSes that let you play GBA games; when we got rid of that old DS, we replaced it with a 3DS; and I used emulators (often those free online ones that don't let you save your progress) to play NES and SNES and old-school Game Boy games (and we also had a neighbor with a real-life Game Boy Color), and after we got rid of our classic DS I started playing GBA games using online emulators, too; and when I lived in a school dorm I got the chance to play a little Switch in the common area with the others on my floor.

...Which means that the only two Nintendo consoles that I never really got to experience either IRL or through an emulator were the Wii U and the GameCube, and of those, I don't really remember the Wii U having any particularly noteworthy games — whereas even as a kid I was definitely always curious about the old GameCube games like Luigi's Mansion and Super Mario Sunshine and Metroid Prime and all that, I still am curious about them now. And so if I have to choose one single Nintendo console, whatever that "choosing" means, I'm honestly going to go for the one that I always wanted to play but never got the opportunity to.