So far my favorite is wool. But I have found it is not a white -white a bit on an unbleached look so can make white fabric underneath look a bit dirty when it is not. Then I used a Quilter's Dream 80/20 - it is a lot heavier and seems not to drape as well. I have used the Warm & White from the Warm Company. I could buy it by the roll, have it delivered, and get it at a discount too. Since I am not making as many quilts lately I may not buy a roll again. It takes up space in my sewing room, and it's drag having to move it around.