Too many times too much is placed on marketing...and unless a true test side by side is done, it is nothing more than hypothetical. I know when I was with one of the manufacturers it was known, as we did not have a hybrid cover, that unless the density of the material changed, there was no difference...i.e. it's marketing.
The question has been asked, if the materials are positioned differently throughout the cover how can there be any consistency? Think about it logically