I remember it was the Amiga 500, but which game I can't remember exactly.
Moonstone: A Hard Days Knight, Sensible Soccer, Hunter, Mega lo Mania are the games that I remember playing the most. So perhaps one of those games.
But I had somewhat 300-500 games for the A500, so there are so many great games that could be mentioned.
The very first system that I played on was the ColecoVision, and I just remember one game; The Smurfs. I didn't enjoy playing on this system very much.