Preferred port of RE1 is the Saturn version. I consider the Gamecube remake a different game as well.......setting zombies on fire? yeah, Its a different game.
RE2 & 3 - Gamecube ports for the lack of loadtimes. I still prefer to play the original ps1 ports for nostalgic value.
Code Veronica - Original Japanese Dreamcast version.
Thought RE4 sucked and havnt played anything beyond it. No zombies=no more fun for me.