If you have access to the real thing, by all means go with it. But It's really up to you, durability wise and appearance wise they will both wear the same. You can always touch up CARC with BEHR too, and you will not be able to tell the difference. As the original OP said, depending on the texture you gun sprays cured BEHR will still rub your knuckles raw and eat sandpaper for breakfast. The guys at Idaho Motor Pool and I would suspect other MV outfits are using BEHR on all their trucks now. And I even "heard" it somewhere that the new waterborne CARC is nothing more than an exterior grade "house paint" with a fancier label and heavier price tag. Sealing wise, the BEHR seals metal beautifully and will protect against rust.