I gave the game a short test and I must say the Mega Drive version is better, the graphics really has less colours but the design (I don't know what other term to use) is stronger. Music tunes are the same but with much better sounds in higher quality. And one recommandation to the end: select low resolution in the menu, then you have the correct display aspect ratio (maybe some editing of DOSBox configuration would also help).
I don't know if I can write the adress here for the Mega Drive version (as it doesn't have to abandonware), so in the case moderators please delete it:
www.planetemu.net (in French). Kega Fusion emulator is also available here, but I don't know if in the last version.