What components are considered when choosing a backing? Is it the type of fabric, thread, stitch or needle?
Predominately the type of fabric. Thread is not a big factor and the needle has little effect, except that you could say a ball point needle may not cut a tearaway as much as a sharp point would. Stitch type can have considerable effect, but most important is the stitch density and tensions, both on the thread and on the hooped goods.