New to Travel trailers- like learning a new language

Aluminum,(stick and tin) is the older technology. Fiberglass the newer. I believe it is a matter of what you like to look at.

Floor plan is the most important because you have to live with it on a daily basis. Also you generally cannot change the floor plan because everything is covering something else.

The wife chooses the floor plan, I think it is in the Bible or something.

You can do also do what we did, rent what you think you want for a week or so. You will learn a lot in a very short period of time.