TCP Global

like said, I have used both. had good results with both. the Nason was more toxic. the isocyanides bother me. I use acrylic urethane as I believe it to be more durable but I certainly be wrong!!
no doubt the higher the cosy of any ato paint the better it will be, as in better finish maybe,, but more durable in UV rays... I am no bodyman by trade, but this is my opinion.
years back, I had a guy doing my bodywork. did 3-4 cars a yr and used PPG. great products, never an complaints bout any of theirs, costs more.

I have asked real bodymen questions for years learning. some will simply say, use the second thier primers, and the better topcoats. BUT you have to be sre of compatability.
its nice for everything we do be the "ultimate", perfect, but not all of us can afford that!! ha