In my case, the OG Xbox. The first console I got, so definitely nostalgia tinted feeling. Fable, Dead or Alive and Star Wars Jedi Outcast are probably my most played games on that platform.
My N64 to remind myself how amazing Golden Eye, Perfect Dark, Mario Kart and Army Men: Sarges Heroes are, especially for when they were released. I also have a modded XBox which has 20+ games on it and some older films on it. Playing modded Halo is always a grand ol’ time and Fuzion Frenzy is a stroll down memory lane for me.
A while back I went out of my way to acquire some used Xbox 360 games and fire up the old beast. I actually played Red Dead Redemption for the first time about a year ago. Some of those games I straight up haven’t touched, because I no longer have said console set up (and have been foraying into console emulation, which is constantly getting better)
I fired up my XBox 360 last year to get a fix of Beatles Rock Band. It’s criminal that that game isn’t available on modern platforms! Also regretting not having purchased more of its DLC when it was still available.
I often play on the Wii with my family. The joy cons on the switch are too small and have too many buttons for my (grand)parents to push. They keep pressing the home button accidentally.
Not super old, but my homebrew 3DS gets a ton of usage. A while back I installed every ROM I could want onto an SD card, which has brought years of entertainment.