I believe Warm and Natural is unbleached cotton batting and Warm and White is bleached cotton batting.
Soft and Bright is Warm Company's polyester batting that can be quilted farther apart and is NOT fluffy. I like working with it. Joann's sells it at the regular price of $10/yard in our store (90" wide). Last week they had a coupon for 60% off batting by the yard, which brings that price down to a more reasonable level.
I use the Hobbs charity program as mentioned above for both the 80/20 and the polyester batting. I am very happy with them.