I also recognize the Waverly brand as being associated with home decor. However they very well may have added quilting targeted fabrics to their line. I've used many of their home decor fabrics and been very pleased.
Regarding the thread count, unless the threads involved are the same size, it is not relevant.
A smaller thread may very well have more per inch yet not be as dense as a fabric with thicker threads. (Hope this makes sense)