Warm and Natural has scrim in it, which is why it doesn't have to be quilted closely. That also makes it a bit harder for some of us to hand quilt.
In general, polyester battings seem to be easier for most to hand quilt, and they don't usually have to be quilted too densely. Wool is also a good choice, although washing it might be a problem.
For cotton batting, my favorite is Mountain Mist Blue Ribbon. For polyester, I like Hobbs Polydown when I want a bit of loft, and Mountain Mist Poly lite when I don't. Some quilters like Quilters Dream cotton.
I bought swatches of battings from Harriet Hargrave's store - if you google her you'll find it. They didn't cost much and gave me an idea of how they'd quilt.
Janet