IMO, the open range is a better unit. With that said, what I suggest you do is go to the blue book for the original MSRP for each unit and see if there is a difference. Quality normally costs more when new.
I agree with the comments about floor plans, but the funny thing is until you live with one you may not know what is important in the beginning. I know our rig has high steps to the bedroom and bathroom. Killing my bad knee after a month or so of living in it. Who knew.
I just saw your post about plywood. Plywood would be fine, just keep it dry. It only goes bad when the end grain gets moisture.