I've had both and I would never go back to a TT with the bathroom in the middle. It makes the trailer hour glass shaped and uses up too much space. The rear bath design open ups the floor plan and allows you to have a more useable bathroom at the same time.
That being said I do like a shorter trailer. If you are going to purchase a real long one then the bath in the middle might work. But, as you go longer you start to get into other problems like, parking, hitching, turning, towing, and of course you must have a bigger truck to pull a bigger and heavier trailer.
Go to some RV shows walk around in some and get the feel for what you like. You can go to dealers lots and check out models too just be careful not to let the salesman talk you into anything your not ready for. Never buy a TT on the day you go to just look.
