Either NES or Gamecube.
The NES revolutionized gaming, but in my opinion its games have aged incredibly poorly and with a few special exceptions like Mario Bros 1-3 they're almost all unplayable today due to very cheap, messy, and frustrating design.
The Gamecube was an amazing piece of hardware, but its first party lineup is horribly disappointing by Nintendo standards, with franchises like Zelda, 3D Mario, and Starfox absolutely butchered. It showcases the very worst of Nintendo's tendency of trying to be different for the sake of being different and in turn messing up what wasn't broken. Still had a handful of truly great games, but overall it had fewer games worth playing than any other Nintendo console except NES.
Bet with Liquidlaser: I say PS5 and Xbox Series will sell more than 56 million combined by the end of 2023.