Quality is not so much what you use but how you do it. Just because you use a high dollar clear or whatever doesn't mean you just put down a quality clear job. Quality is in the heart.
As far as the collision industry, most shop who are certified with a particular brand has to stay within certain guidelines of products to maintain their warrenty. Absolutely NO crossbreeding of brands!! Most brands have a number of clears to choose from so it's not like we're locked into one clear anyway.