Everyone will have their preferred brands. The same "methods" are used to put them together. There are differences in the finish of certain items. We like the puma line. It is not necessarily the top of the line, but we have had success with a couple of them. When comparing them to brands at the local CW, I find that the lines they carry appear to be "cheaper". The trim, finish of the cabinets, extra touches, etc. all make a difference IMHO. When we bought our last TT, it was between a rockwood and a puma. The Rockwood was clearly the winner when it came to fit and finish. I was leaning towards the Rockwood, but the layout of the puma worked better for us. The puma still had all the things I wished my last RV had. The rockwood cost almost 10k more than the puma by the way.
I was asked by a newbie a few years ago about what to look for in a TT and how are they priced. I told him to look at the cheaper models, look in the cabinets, storage areas, drawers, etc. Then I said to look in an expensive TT and do the same thing. Then you decide what is important to you.