Thanks but I meant to talk about actually usable modes that were used in commercial games. I'm not biased towards either system as a fan of both but I've never seen a game using HAM and please don't dig out a text adventure that doesn't use sprites and such.
64 colors are standard in MD with 183 in shadow/highlight mode.
Of course AGA has more than that but the original post was about 500s so I didn't feel the need to specify OCS/ECS here. Again, I assumed that this was a comparison thread between the gaming capabilities of a MD and a 500/500+ but perhaps people interpreted it differently after the OP.