One of my "musts" was hard walls and minimal canvas. We were looking at a Roo/Shamrock 183, 19S or 233S. We needed sleeping for 6 minimum (really only 4 but have you looked at campers that sleep 4? I wouldn't put anyone on the foldout couch or dinette for the length of time we need to) and room for a baby. The only reason we shied away was the canvas maintenance/possible repair. I know plenty that are fine with it, but I had the extra towing room and opted for a hard side BH.
Another was no carpet. I dont want to clean carpets after a camping session outside. I will Swiffer a linoleom floor fine, but not getting that stain out of the burbur...
AC, and a good one at that. I grew up tenting (parents didnt get an RV til i left the house) and hated my cousins for their RV during 90F days and 80F+ nights with 80% RH. Since I was dropping the money, it was going to drop the temperature!
"Big" bathroom. Now I put the big in quotations because in a lightweight bunkhouse camper, that is a falacy. Our model has the outside entrance to the bath which makes it about as big as you can get for a bunkouse. We also needed a full enclosed tub to wash the baby.
Finaly, our last "must have" was living area slide out. My girlfriend didn't like the floorplans where only the beds slide out. (rear slide expandables). She wanted living space to open up (thats where the 233S Roo shined). Our TT doesn't slide much, since it is a kitchen slide, but it does open the living area up some. Its amazing what even a 12-18" slide accomplishes to open a space.
All of these were considerations we had to make, but weight is ultimately the final issue we had to contend with, as we only have a 1/2 ton truck. If you upgrade to a deisel 3/4 or 1-ton, the sky is the limit...
Our 27BHKS gave us all of what we wanted for a fairly low weight, and for a fairly low price. Biggest thing is, write down what you want, take it to a good dealer, and they will guide you (hopefully) to your dream rig.