I can start with Rygar as a prime example. Everybody that knows Rygar should know that the FC/NES release was considerably different from the Arcade original. For me, i like the more in-depht of the FC/NES port, and i also like the fact that the game has some early RPG influences etc.
Kung Fu is another game where i think the arcade original is much better than the FC/NES port of the game. Overall i feel it has tighter controls but also shares a lot of more nostalgia to me personally, so this might be why i prefer this one.
Seishun Scandal...i think its called My Hero for you westerners. Anyway, it was released on Mark III/Master System and Arcades. I really really like the Mark III/SMS version, but since it only contains one level of the original Arcade release, i must say that it is a pretty lame port when it comes to the fact in what they ported of the gameplay itself. But i do must admit that the console port is really good for being released on a card and that it is one of my favourite games for that console.
So anyway. Do you other guys have some other interesting opinions about games like this? I find it interesting since many times i feel that games that have been tried to be ported as close to arcade perfect as possible might fail due to the fact of hardware limitations of the console, and that it was not until PSX era the games really could be considered pixel perfect in my opinion. So for many of the games, i think that the uniqueness of the port, like in Rygar, was a real benefit because if we compare the Nintendo version vs the Sega version of the released game, i think the nintendo version is far much more a better game than the Mark III one.
Anyway, shoot!
