The big draw in professional porn is that the lighting and sound usually is very good, sometimes though the overscipted and overacting gets a bit annoying. There are more and more amateurs that are starting to get lighting and sound better, but I still too often see stuff where you can hardly see anything(too dark) and there is random music playing in the background(or TV) that makes it hard to hear anything but that.
I do enjoy both that being said, but i flip flop between them.