I've used W&N and liked it, at the moment I'm using Quilters Dream Cotton. The QD seems thicker than the W&N - but I notice that it's leaving a lot of fabric dander on my quilt AS I quilt it. I wouldn't exactly call it bearding, and it is highly possible that the only reason I notice is because parts of my quilt are black.
When I can find it I am desperate to try wool.