I use Warm and Natural but recently I used a piece of bamboo batting and it was SO soft!! I tend to buy several yards on a roll and just cut off what I need instead of packaged batting.

I think the type of batting you use depends on how you plan on quilting the top. Hand quilters sometimes prefer a bat that is very easy to push the needle through and I've heard reports that Warm and Natural/White can feel like cardboard on occasion.

Most of the quilters at my guild use Hobbs 80/20 batting. I haven't used it yet but would like to try it some day.