I've had a heap of systems over the years or in the case of the one I'll nominate used a friends a lot, but it would be the Atari 2600 and all 'flashback' variants as I have had those. I started out with friends who had that and the test launched NES in 85 I got. The 2600 just didn't have much good variety to me and most the arcade ports were pretty sorry. I never much liked the joystick on the thing and even against stuff like the coleco or a Fairchild Channel F my mom had I thought the audio more or less was underwhelming too. I won't touch the thing anymore, emulator, flashbacked or otherwise. It wasn't that hot back then and has aged horribly.