Our first critera was the ability to access the major things we wanted with the slide IN!
bedroom, bathroom, fridge, stove, microwave, dinette, kitchen cabinets.
You'd be amazed at how many trailers are really limited with the slides in.
If not, it was off the list. We want to be able to stop at a rest stop and do a meal with slides in, and be able to pull in the slides in the evening if we want to depart early in the morning with minimal effort.
Then it was floorplan we liked, only then was it a choice between brands.