As someone who has never owned a Dreamcast, and only played a very small amount of Playstation 1 games years after the PS2 was already out, I obviously voted for Genesis. I had a Genesis as a kid & have fond memories playing Sonic, Streets of Rage & Aladdin etc. I still pull it out every once and awhile when I'm feeling nostalgic. It was a great console!
I had a long list of video game systems but I remember the playstation one. Use to play Resident Evil on it. Mom said we had a Genesis but I have no clue what that is now.
I really can't say, I never had any of those systems. Though a friend of mine did speak highly of the dreamcast... I think I would go with ps1 since playstation is still making consoles, they must have been good. The other two are long gone.