After reading over the previous posts there was some good information, but I feel it is a bit misleading. Within some of the model lines there are super lite models, mid profile models, full profile models, and trim levels.
I have no solutions as to ranking them.
The first two things a perspective buyer need to define is; do you need a unit rated for full time and under what climate conditions. After that your budget and personal preferences will take over. If you are new to this there are four season, sub zero, rated units out there with 3" walls, most are under 2 inches.