Most brands are owned by two companies Forest River and Keystone (Thor) with a small handful of independent mfgs. The independent mfgs don't have the purchasing power of the two big mfgs and thier prices are generally higher.
I always wanted a Northwood Artic Fox but the price was twice as high and getting a lot of people saying their quality isn't much better. Airstream is owned by Thor along with a page of other brands.
The key to any RV regardless of price is maintenance for longevity. Water intrusion is the Arch-enemy of any RV. My dealer told me when I ordered in my new 5th wheel that there were two types of RV'S (Those that leak and those that will leak).