I don't have specific info one campers, but I can relate it to boats.
You can buy a bayline for half of what you can buy a cobalt. Similar boat, they both do the same thing, and you can even get very similar engine options if not identical. They are both boats, they both will pull tubes, skiers, wakeboarders, etc.
Brand new, they both look good. But, the Cobalt was 2x as much.Most likely, the Cobalt will give better performance brand new, may be more efficient, etc. It was also feel more solid because of design, insulate some of the sounds better and often have more features. But, they'll be close enough for most people.
Fast forward 5, 10, or 20 years and the quality of construction comes out. The cobalt will still look good compared to the bayliner. The upholstry will be in better shape, the gel coat will look better, the hardware will still be mostly screwed down, the carpet and dash leather will still look nice. All this assumes similar type of care. Covered, etc. High end products often age better, maintain their performance over time and fall apart less.
Boats get beat to hell. So do truck campers.
Is a cobalt worth 2x the price of a bayliner. Maybe, maybe not. It depends on the person. We bought a used 2002 Cobalt in 2007. By and large, for those that don't spend a lot of time on our boat, it looks new. The styling looks great, the gelcoat looks great, the upholstery looks great. It has held up well. You may find a similar experience with a truck camper.
Again, I'm not an expert in truck campers. I just got my first one and stayed on the low end. Palominos were certainly interesting and very enticing. Depending on where you are going to go with it, it could impact which one you get. Also, some may have certain features, both mechanical and convenient that make some better than others. Slide-outs come to mind.
I looked at Northern lite and really like the fiberglass outer. To me, it seems that it would be better sealed and have structural integrity with it. That probably comes from my history with boats. I don't know if that is the case or not.
I really didn't answer your question, but shared some potential thoughts.
1995 Northland Grizzly 860. 2355 lbs of purple goodness! Sold
2005 Lance 845 - Baby Bertha
2007 Chevy Silverado 2500HD Classic CC SB 4WD
Torklift mounts
Torklift superhitch
Hellwig swaybar and 3500lb helper springs
2002 Cobalt 226 "Baby Blue"