I think it also depends on how many quilts you are making. At the speed I complete a top (that would be "not fast")and the amount of money and effort i have in it, it seems silly not to use Quilter's Dream. OTOH, if you are prolific with charity quilts, i'd use W&N. I think the two feel completely different. Harriet Hargrave says that W&N was designed as window shade insulation, and, to me, that's about what it feels like.
If you need to buy it at Joann's, I'd consider one of the other types they carry. Hobbs products are well-regarded.
QD does come in a roll (I've seen it at a LQS), but I'd expect it's pretty pricey.
Hugs,
charlotte