What console do you still turn on from time to time today?
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.
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.