Ever wonder how your RV was built?
How to compare quality from one brand to another?
Quality can be many things. If you mean the absence of defects, then there is no clear distinction. RVs are basically hand built, one at a time, and each one differs from the last, so the manufacturing process never gets finely tuned for zero defects. Human mistakes are common and seem to occur equally in all brands & models.
Quality of materials, however, tends to follow price. If one RV costs less than another of seemingly the same amenities and size, you can be pretty sure that the less expensive one has skimped on materials. Light duty frames and running gear, cheap tires, cabinetry made of particle board and paper veneer, marginally sized wiring, cheaper components in things like charging systems, plumbing and lighting, poorer insulation, decals that fade quickly, and lower quality paint jobs are some common examples. RV pricing at the wholesale level is fiercely price competitive, so a difference in MSRP will clearly indicate a difference in the cost of construction and therefore build quality. At the retail level, dealer pricing (discounts) can vary quite a bit, though.
There is not a lot of variability in the size & type you are looking at. A 25 foot travel trailer is basically a commodity, an entry level product. It's a box on a steel frame, built using standard components from the same suppliers that many other manufacturers use. Stoves, water heaters, fridges, water pump, a/c, furnace, etc. will come from one of 2-3 major suppliers of those items and the component quality is similar.
In general, heavier means more rugged. The recent trend toward "lite" has produced trailer frames that bend/twist, undersized axles, and other hidden means of reducing weight. You may not care if you don't travel far or often, but for extended travel you want a rugged chassis and suspension.