I had very good build quality on my both Arctic Fox and Host. There were minor things that had to be corrected, but nothing essential that left me without the use of the camper or appliances.
If you are looking at the best build, I still think Northern Lite shines above the rest. However they do not build a layout that we want. I feel Adventurer, Eagle Cap and Lance quality has slipped and I would be less likely to recommend those makes to people unless there is an exclusive layout they want. I have not looked close enough at any of the other brands to give you my impressions or track their trends.
I will say that Arctic Fox, Eagle Cap and Host are the heaviest campers and they also seem to be the ones that match my usage and preferences the most. They have big propane, holding and water tanks, large/multiple slides and substantial storage. Northern Lite is proof you don't need to have an overly heavy unit to have quality, but they do not have the storage or capacities of the these heavy units.
I look less at price and more at value when shopping. If the build quality, size and features meet your needs, what are you willing to pay verses settling for a less expensive product that does not meet all your criteria. When I was shopping trucks, I liked the Ford better than my Ram but found better value in the Ram and could not justify the higher Ford price. The differences in the Ram were not that far off from my expectations, otherwise I would have bought the F550. You will need to do the same when shopping for your camper.