I've had good luck with fusible fleece for wallhangings and if there is an area that I want the quilting to pop or I want a trapunto effect I will add a layer of scrap batting on top of that. I've also used warm and natural with the scrim and liked that as well, again adding another layer of whatever I've got left over in the scrap bin if I want more definition to the quilting or want a trapunto effect. I've also had good luck with different battings scraps that I've zigzagged together, but sometimes these have been a little more problematic n terms of thread breakage or other tension problems while FMQ, due to the different densities of the types of batting and thread build up from too many small pieces zigzagged together-- this has produced some interesting effects on my art quilts, but probably wouldn't be everyone's cup of tea
Rob