I’m partial to Featherlites as they have always done well for me. Our local Featherlite shop sold out to Shadow Trailers and is now a Shadow shop. I looked at them and they were OK. I guess by that I mean they are a “C” level product.
Our shop used to carry Silverlite trailers and they did look nice. They had a front raised area over the gooseneck that gave the entire trailer a REALLY nice and airy interior look. Sadly Silverlite is out of business although you can still find used ones around.
I’ve seen some Merhows and they were very well done and appeared to be of very good quality.
I won’t have a Sundowner on the place. Never owned one but we had a client who did and the LQ part was very poorly done. This, along with some structural issues, takes them off my list.
The former Featherlite shop fixed other brands and they had a Kieferbuilt in for some major work. I got a chance to look at wall construction, frame construction, overall quality, etc. I was not impressed and would not buy one.
I had picture of a custom LQ where the area over the gooseneck was raised to about 6.5’ ceiling and became a real, small bedroom. I cannot, for the life of me find it! Didn’t find it on Google, either. Very frustrating. If you go to a genuine custom builder I suspect this could be done. It won’t be either light weight or cheap (meaning not just more trailer to haul but a bigger truck to do the hauling
). It would enhance livability, though!!!
I don’t know anything about Bison trailers but here is an offering that does give a more “livable” interior. https://horsetrailerworld.com/home/trailerdetail.asp?ID=1178385
Our LQ is a weekender and for one person it would be OK for a while but it’s likely “cabin fever” would set in quickly! The illusion, at a minimum, of more space would be worth paying for if it’s going to be a long term abode. Living in a cave will get old quickly.
As with so many things the question is “how much money you got?” If you’re flush then you can have a “taj matrailer” with all the trimmings. Of course if you’re that rich then live in a nice hotel, put your hired help up in Motel 6, and let them have the horses ready for you when you arrive!!! 
Good luck in your search.
G.