I use W & N almost exclusively.... because I bought a roll of it twice. I seldom hand quilt so that doesn't impact my choice W &N does not claim to be 100% cotton, I like the scrim and even with dense quilting I has enough loft to please me. I have had folks comment on the warmth of the quilts I make and well... that is part of the purpose, right? I had the opportunity to purchase a package of Quilters Dream and loved it but the cost between W & N and QD was significant. I make primarily donation quilts and cost is a factor.
Using just one brand of batting does allow me to piece batting easily which is another plus when making donation quilts.