Just like GBC and PC, the game is entirely something else on the Dreamcast version than what you can see on the PS1 version. Since PC and PS1 were also separated despite the very minor differences. I suggest Dreamcast version gets it's own category too. For reference : Dreamcast : PS1 :

There's a PS2 version, as well. It's the same as Dreamcast with some add-ons like brand new stages to play.