In my opinion Aluminum Frame is the way to go. (lighter weight, doesn’t rust) For a fancy all-aluminum house with power lift system, check out Custom Cottage. For a less fancy all-aluminum house with manual lift system, I’d go with Ridgeline.
I was looking at a yetti fish house a few weeks ago, they look to be built nice and clean and are 100% aluminum exterior including the frame. I think the guy said like 5500 and the inside is insulated but that is it. Check them out.