Much has been written here on this subject and the conclusion is there is no reliably good choice. All the brands produce unacceptable percentage of lemons due to random production flaws, and most all of them have enough oddities of design or outright design errors to be downright frustrating. The more expensive brands are better quality in the sense that their cabinetry, upholstery, flooring, insulation, and general fit & finish are better and they have features under the covers to make the ongoing ownership experience better, e.g. labeled wiring harnesses, or plumbing access panels.
If two RVs appear to have the same features and size but one is cheaper than the other, you can assume the cheaper one has cut corners where most buyers won't notice. RVs are extremely price competitive, so no manufacturer is simply charging more for the same thing. Therefore price is an indicator of build quality as well as features.