I had to go up to my greenhouse... inside with a push broom... and bump the snow off from inside. The chickens all clustered as far away from the madwoman with the broom as they could get, and muttered amongst themselves. “Don’t excite her... act like everything is perfectly normal... maybe she won’t notice us.”
We started out with freezing rain and then high winds and around a foot of snow, so it really stuck on the damp south side. The wind was brutal and from the north, so very little snow accumulated on the north side—it got blown around where it drifted on the south side, right where I needed some space to put the snow. I had DH plow right beside the south side, as close as he could get, then I shoveled it away by hand, but at least I had a place to put it. The snow was so sticky I could hardly get it off the shovel.
But yes, if the snow stuck to my glacier greenhouse so that I had to push it off, it will stick to a hoop house made from cattle panels for sure, or a carport tent. It may not *always* or even often stick, but sometimes it will. If you want something that’s guaranteed to slide off, a true A-frame seems to me like your best bet. It’s not an efficient shape space-wise, but roofed with ag metal, nothing will stick—or at least not very thick. Plus it’s easy to build if you’re building for undemanding folk like chickens.