Have you driven any of them? Are you satisfied with the chassis as engine? Which one has the least rear overhang? What are the towing capabilities?
I would normally say, go for the floor plan first but... a few of the items I mentioned above might out-weigh floorplan.
We owned a Seabreeze by National in the mid 90's. I thought it was a well made coach. They did go out of business, but that would not deter me if the coach met my expectations. I think Newmar makes a good product but they always seem to look like my grandmothers house inside.
Best of luck in your search.