There are physical diffeences.. In some respects I like both better than the other ones... All I can say is look at the two units in assorted campgrounds.
Dometic (A&E Weatherpro) has one arm/bracket that is mounted to the RV, then there is one with a gas strut/shock and two more arms ..
The Carefree has the multiple jointed flat extension (like a pop up canopy)
The A&T is genrally "Slanted" down as it moves away from teh RV where as the carefree is flatter.
As I said, there are things about both I like. but I have an A&E... Less than 100% happy with it, but I suspect I'd not be happier with a carefree. And modern A&E they have supposedly addressed my major complaint.. (Wind sensor) other than that I like it.