The PC has no weather, and dumbed-down Special Stages compared to the Saturn game, but the rest of the aesthetics and all of the music tracks are the same, putting it miles above the Genesis game.
^Also gay, another one-liner post from me... wait, this saved it!
I remember that it does have a rain effect in Rusty Ruin, but there's no fog or whatever.
Doesn't the manual say that there's fog? *checks, but only because the cover happens to
be within arm's reach* Yep. "some parts of the Rusty Ruin Zone are drenched in fog and rain"
About the music, I think I might prefer the Genesis one overall. Not that the PC/Saturn one isn't good.
Now, getting to the part that's actually semi-important, if actual game graphics will be used
(which is great, if there's a way to rip backgrounds, which seems to be possible
(how were TSC's maps for side-scrolling games made?)), the PC/Saturn one would be better,
unless it looks cluttered and distracting. But then, maybe the lack of detail in the
Genesis version's untextured grid floors would look fine as part of a huge map.