At first I was going to say SNES, since I did not own one as a kid and I’d have the chance to play all the 16-bit games I missed, but instead I’m going to say PS1. The classic SNES games are being re-released in various services or packs including Switch Online in their original form and if push comes to shove SNES emulation has been quite good for a long time. I’ve played even less PS1 and it has a huge library full of “hidden gems” and classics in all sorts of genres, many of which may never see a re-release on retro consoles or services. Just pick a type of game you want, the PS1 probably has it, something that even the SNES may not be able to say.