See the Keepsake Quality fabric discussion. It's not about these brands, but you might find it interesting.
Kona was always very soft and nice. I haven't shopped for these brands in a while, as I'm trying to use from my stash for as long as I can. However, I believe it and what bothers me is the shrug you got by your QS owner. The local one (only one) here doesn't seem care either.