It doesn't help showing on a car, you can play tricks with camera, lighting, and all sorts of other factors to make one look better than the other.
The bottom line is quality. And by doing a closeup discussion of the quality, you get a better understanding of what one product is and isn't.
Here's a writeup from an actual customer of both.
http://forum.e46fanatics.com/showthread.php?t=341112