IMHO cotton batting needs to be more densely quilted to prevent the batting from shifting. Poly batting can be quilted further apart, say the width of your hand with your fingers spread. As for High loft poly batting, I only like to use that on baby quilts that I will tie; I do not like hand or machine quilting high loft. My favorite is Warm & Natural, as it has a lovely drape and I can quilt it as much as I want.
Just my opinion; your mileage may differ.