Quilter's Dream Poly is a nice thinner batting with consistency in how smooth it is across, not pulling apart like a cotton batting, when you stretch it a little. I use it a lot, nice drape and not too heavy, low loft.
I agree with JT and am now using more of the Quilter's Dream Poly, because I'm really, really tired of the wrinkled look from cotton batts. Just me. I have not tried the Thermore, but used Hobbs 80/20 exclusively for the last 7 years.