So much depend on your needs. When I retired we needed, a bed you could exit without crawling over your spouse, a good sized bathroom, pantry and linen closet and a bed for the dog.
Others need much more, some much less. The Scamp, Casita and A-liner really appealed to us but in the end, they were too small for our travel plans.
So, we rented the size TT we needed with a floor plan we liked for a week in the Ozarks. We learned a lot really quick before we spent the big bucks. Later we found a used TT we wanted.
Finally, it would never buy a TT without seeing it, to many subtle variations and surprises.
Good luck