I wasn't to thrilled with EX-P or UPP on my car. The durability with the two just seems to lack from what I seen on my car as well as others. As of now I have Meguiar's #21 on my car and it looks good and still feels pretty slick. Only time will tell about durability as I just applied it a week ago and the weather has been fairly mild.
I have not noticed any differences between EX-P, UPP, #21 or P21s in the looks department. They all look good, I didn't get a "deep glow" or "sharp, black glass" look :nixweiss .
They all looked great, so at this point i'm going to use whatever gets me good durability which i'm hoping #21 can do for me until spring comes and bust open the TS. :dance