Why not make up some muslin sandwiches and try each one out? The sale is good until Feb 5th (assuming they don't run out of inventory, as it is only what they have on hand).
Another consideration when choosing between wool and cotton is loft. Cotton hand quilts much flatter than wool. The loft of 80/20 is more similar to wool than to cotton. One of the reasons hand quilters like wool is because it gives such good definition to the hand stitches.
Austin, you might want to get your mother to try Hobbs 80/20 or wool batting next time she hand quilts. She probably does not realize how much easier they are to needle. The scrim in Warm and Natural makes the batting very stable so quilting lines can be farther apart; however, the scrim makes it harder to hand needle. My thought is that the easier a batting is to needle, the easier the repetitive motion of quilting is on the joints. However, this is speculation on my part as I don't know that for sure.
Last edited by Prism99; 01-11-2018 at 12:27 PM.