I use warm and natural or warm and white. In the early days, that brand had oily nibblets in it that required washing. Since then, the process has been refined and it is not necessary to prewash. If it's wrinkled and won't hang out, I throw it in the dryer with a damp towel.
My main reason for not prewashing is the effect of the shrinkage on the finished quilt.
.....but as with so many quilty things, it is personal preference.