Perhaps responses here are slow because I am not sure your question has an answer. As a general rule, in comparable price ranges, the similarities between units are much greater than their differences and what difference there is likely depends more on variance in quality control that day, than other factors.
Every manufacturers sends out some very good and some very bad units and it is virtually the luck of the draw as to which one you get. Owners who get a bad one blast it, while owners who get a good one praise it. I think if you run a search on the Internet, you will find complaints about every RV made. Of course, folks who are unhappy often have more to say than those who are happy and say nothing at all.
I would encourage you to either learn enough to be confident in your ability to go through any unit you intend to purchase, take along an experienced RV friend with you, or hire an RV technician to spend a couple of hours going over it with you.
I think buying based on brand name alone is a mistake.
My two cents,
Steve & Andra
02 Ford Powerstroke 7.3
Current "Next Last" RV - 08 Copper Canyon