I couldn't find any comparison anywhere. It was ported to a lot of systems and I've always wondered which was best. I'm sure the FM Towns and/or X68000 version is arcade-perfect, but I'd like to know about the less obscure versions. I vaguely remember being told that the SMS version was somehow better than the Mega Drive version, but I could be mistaken (I'm also interested in the PC Engine version, and maybe Amiga). Anybody know?