The good stuff is poly urea, and it's great stuff, when the surface prep has been done properly. I went to a Sherwin School Dallas for a couples days to learn about applying poly urea in industrial applications. They use the same pump to install the spray in insulation in houses.
Key points,surface prep is everything! Also exactly where the product is applied,I'm not talking about the truck but whether it's done in a climate controlled booth or not.
Much like undercoating these "liner" products can trap moisture between the vehicle and linercoating.Depending on where you live,this can cause rust to form unseen under the coating. This is why a climate controlled booth is best,be sure they have the lowest humidity possible.
In the early 80's they coated the panels of make cars and trucks to resist rusting. While not the same product it still trapped moisture and actually cause rusting in places you'd never normally see rust occur,like the middle of a quater panel.
I wont offer an oppinion on which product is best or better,this is because the best product isnt any better if the application is shoddy or the enviorment isnt controlled.
YMMV.
