Quality? I'm going to get in trouble for this reply but here it goes anyway!
Number 1, it comes down to brand loyalty if your asking for present owners of those brands!
Second, When we were looking around I asked questions and like most when they purchase new/or used for that matter, We were told that the dirty little secret was that your cabinets, beds furniture were all bought by the many brands out there from pretty much the same manufactures! Look at a few units of different brands and judge for yourself!
This all depends on what trips your trigger when you look at a floor plan!
Then it can get technical where quality plays a big part.
Is the structure aluminum frame? Is the frame welded at the joints or are they riveted? The other part of that is if the floor is out in one piece or is it laid out in panels of some size or dimension?
Then of course are there any loose screws or fasteners on the cabinets or any part of the unit you are looking at? Loose or missing screws or saw duct or the presence drilling waste could indicate poor quality!
quality control! Theres that word "quality!"
I own a Heartland, not a Big Horn. The customer service is second to none judging by other CS post of other units
For me, it all comes down to All RV's are created equal until I know how it was built, what it offers structurally and has it got the floor plan I like!
Like I said, you will have a lot of customer loyalty responses! I have owned used units before and our first new unit was a 5er, that just happened to be a Sundance by Heartland, "not the top of the line RV by no means" but its what we liked in 2009, its a 2010 and we have been happy with the sale, and the customer service when I needed them and never had any stress for minor things that needed fixed when it was new. That is your quality because all units, just like a vehicle can be a lemon or have issues! Its how they are handled that counts and to me that's quality considering the first 2 statements!
Heartland owners have a forum that can shine a light on the many happy heartland owners and what seems to be a great ask the factory thread!
The brands you mentioned are all good quality!
I would buy any of the brands out there once I had an idea how it was built and if it met my floor plan ideas!