If you think I inferred a difference in quality between the -A, -B, and -C manufacturing methods of making pex, I'm sorry, that is not what I intended. They all meet the requirements for use in a home. Type -A was the first, and as process technology advanced, other, less expensive methods were developed, resulting in -B and -C. It just happens that -A, the first method developed, remains the one with the most complete, longest chain polymer which makes it the version with the smallest bend ratios and the only one that can be restored if it gets kinked. It has the best memory, and is generally installed with the use of an expansion system, but cinch rings can be used on it.
The biggest thing with ANY pex, and most materials, is good ingredients and proper quality control during manufacture. Errors can happen with any of them, regardless of the type. Some have been doing it longer than others, and, I think, the only one that has a vertical manufacturing process (where they control all of the processes and ingredients) is Uphonor. Doesn't mean others are bad, but if you have an issue with theirs, someone within the company messed up, not a supplier.