I just went through this & settled on a Grand Design. We started looking at Jayco & maybe it was the dealer we looked at but everything on their lot looked like it was put together in the dark. Brand new units with led strips hanging off, massive gaping holes in the storage compartments with zero expanding foam to close the gaps, wires hanging out of the slides or cabinets. I even joined the Jayco forum & posted a thread asking the same questions about their quality. Now I understand that these units were just delivered from the factory & not prepped yet but I was seriously concerned with what I saw.
Then we looked at Keystone units at three different dealerships, they were slightly better but not by much. Same wide open storage concerns & after having mice last year I’m super sensitive to entry points so those units were a turn off right away. Once looking into the storage compartments you could see wiring all over the place, sloppy screws, missing screws etc. The insides were a little better but not by much.
Finally we looked at Grand Design & while not perfect they at least had tight seals, tidy wiring & straight trim. We settled on a 290BH Reflection 150 series which is not even close to top of the line but appear to be built a few steps higher than price point would indicate.