If you think about it all MH MFG's use the same chassis to build their house one. They all use the same systems, refers, WH's, Jacks, AC's etc. The house portion is either bonded walls or hung walls. If bonded walls I can't find any MFG that tells you what adhesives they use they just use marketing terms so I don't think one is any better than another. These can all delaminate. Newmar uses the hung wall which cannot delaminate so to me this is a discriminator. Winnabago seems to have better documentation as far as there wiring and systems on line. Tiffen seems to have good customer service to fix problems afterwards but don't seem to have fewer warranty problems that the others. As far as higher end models having better quality they use the same production processes, workers and materials for the house portion but more expensive counter tops, fixtures, TV's,outside entertainment systems etc, which to me does not make it higher quality. To me the big things to look for is the CCC, how weight is distributed, 228 or 208 min WB, ample storage and FW. Some systems are better that others I would choose the HWH over the Lippert system for jacks, would stay away from the Norcold 1200 refer and Swintec slides. If buying older good maintenance trumps brand from what I have seen. Good luck in your search, it is not easy.