Went with Altered Beast. I remember playing for the first time in 89 on my friend"s Master System, then played it on the Genesis in 90 at my other friend's house who was the only Genesis owner I knew back then. He had a lot of the greats like: Revenge of Shinobi, Altered Beast, Herzog Zwei, Golden Axe, you name it. Once games like Streets of Rage Strider came out, I wanted to sell mom's jewelery in a stand on the street I lived on to get a Genesis.
I have to admit that Altered Beast didn't age all too well, but I still love it for it was in the day.