I think OUYA is the obvious choice.
In all seriousness, though. I guess it would be the Genesis? Aside from the Atari 2600 clone I owned, I never owned any non-Nintendo consoles until the 6th generation. But the Genesis was the system a few friends had, so it's the one I had the most exposure to. Plus, I have those 40-50 or so Genesis games on Steam, and a few collections on the PS2 and PSP.







