Hi,
If your looking for warmth then go with the flannel for the batting. I have used flannel and it is great.
I bet that no matter what you decide to use for batting the quilt will be wonderful and bring lots of joy and warmth.
Pam
oops read you post wrong thought you were talking about the batting to use, duh - its an age thing, lol.
But flannel is nice for the backing also.