I have made both types. The ones with batting in the middle are very, very warm. If that's what you want, I admit it looks nice but it is also relatively stiff (at least with the Warm and Natural I used). However it is too warm for just laying over my legs in the living room even in the winter. The ones with just 2 layers of flannel are better as a lap rug in the evening. I also generally use just two layers of flannel in the baby quilts so they drap better around the baby.
Pam