Low cost, light weight, high quality.
Pick two.
All manufacturers struggle to find the balance of the three that will make them successful....
If it were so simple and easy, everyone would be doing it.
Couple those three competing factors with the fact that the industry has found most new TTs are used by the original owner 2-3 times a year for three years.... And then never again.... That explains why TTs are built the way they are.
It is much easier to build a heavy TT that is high quality,,,,, but then that leaves out the 1/2 ton crowd as potential buyers.
My 2010 Sabre was such a unit. Sabre doesn't make TTs anymore. Only 5th wheels. 5vers are generally heavy, and expected to be so. Those consumers generally don't mind driving a HD truck.
I am not sure who makes the best right now, but keep in mind that the components such as ACs, fridges, heaters, water heaters,etc are the same.
In my mind, the frame is the foundation. Get a stout framed unit. It will likely be a heavy one. Then get a capable truck for it