When I first began quilting only Mountain Mist was available locally and I liked it. Sorry to say that over the years the quality has gone down, too thin and uneven.
I use Hobbs 80/20 a lot, soak and dry it first and it's nice and soft. Thermore is nice and thin but it annoys me as it sticks to my fingers. Latest favorite is Quilter's Dream Poly, a bit more expensive but it's so good. May in Jersey