The difference was that it worked and the quality on pc may vary depending on how much you spent on your computer. As far as that magic carpet game is concerned it looks fine to me and allegedly quake was running 60 fps on the ps1 to the developers surprise. The ps1's main drawback was processing 2d and bad texture rendering as seen in a game like tekken 3.
www.racketboy.com
Games didn't need to look too good the jump to 3d was enough at the time. That was the latest craze. Consumers didn't care too much about the use of 2d sprites in their games or draw distance people wanted to game in the easiest quickest way possible.
While were at this do you remember this?
Without looking into this too deeply we can see the hole in this. Developers will port any given game to a platform if it will churn out money for them. As to my knowledge nintendo is the only game company that has ever kept their games exclusively on their systems. Everyone else made pc ports to squeeze out some money. Even segas did this when they made dos versions of their genesis sonic games.
(ho boy here come the console warrior allegations.)