I'd guess it's pretty much a matter of economics more than "better than"...
Manufacturers have to make a certain percentage profit and they have to buy the materials to construct the RV. How they spend the money matters because what's left over is their profit. They MUST maintain the cost point if they are going to be competitive with other manufacturers products in the same price range. That makes for some very narrow and difficult buying goals for the purchasing department as well as pushing the assembly line to maintain a schedule with no overtime.....
XYZ may choose to cut the cost of the frame and use laminate under the slide while ABC may choose to use rubber sheeting in the pass through which costs more than vinyl and make up the cost by using thinner cushions on the dinette.
The key, I think, is finding the RV that works best for you and has as many of the features you feel are mandatory. Then, add the remaining features to build your "perfect RV".
We all have bought houses with "FHA approved" carpet knowing that the first thing we want to do is upgrade to something better...... RV's are really, nothing more (or less) than a stick built house on wheels, so approaching it with somewhat the same realization that changing, upgrading and rebuilding the parts we don't think are "just right" is as much a part of RV ownership as it is "home ownership".
Every marketing department has their "claim to fame" be it a Polar Pack Plus, an all LED lighting package, a "standard BBQ grill or whatever fits their "must have" list. It's pretty much all a marketing scheme to get you to buy "the best" from them.....