Hmmm, let me do a paste from a other post of mine, regarding this. Not much time to do more right now ^_^.
"Actually, after i tried Mameox 0.62b, i think most people should give this emu a try.
My main concern with it are the "crackling sound" and some frame issues in certain games but, it must had a but, lol. I say give it try not because some games runs better, but because some games only run in Mameox.
For example, a person here said Mortal Kombat. Ok. But Bomb Jack, Bubble Bobble 2 and Cadillacs and Dinossaurs, 3 of my favourite games of all time, among others, only run in MAMEox.
And also, you can set the screen size on Mameox to full screen in games like Dragon Ninja etc, a big plus for some people.
My Advice is keeping both emulators, but lately, MameOx seems for me more compatible and stable in some cases, even that both ports are excelent.
I am working on compability lists of both emulators. Maybe i will finish them someday, lol. Damm real life hehe.
"