I got the original on release but couldn't get through it due to game breaking bugs. Gave up, bought it on 360, 100%ed it and never started the original PC version again. In my 10 hours in the Remaster I have found one bug, the quite well known sound bug. Found
the fix on the Steam forums and it's been flawless since then. I have seen the comparison pics showing some less than stellar changes but that's nothing I think about while playing.
So in the end I have no idea which one is preferable since I don't know if they ever fixed all those bugs in the original, but the remaster is working very well for me.