different battings require different amounts of quilting- some need to be quilted every 2" (quite dense) others allow up to 10" apart- and everything inbetween-
it is a personal choice how much quilting you like-lots or little- it is important to choose a batting that meets the desired amount- if you want to tie your quilt or do very little quilting choose a batting that allows up to 10" between quilting lines- if you like a bit more choose one that needs every 4-6"- if you like dense quilting choose one that needs to be quilted every 2"...it is all a personal choice and really dependant on the individual project- i've made some heavily quilted quilts- i've also made some with very little/just enough- each project is different & requires it's own design. i long-arm and have many customers who do not really want heavily - every inch quilted quilting- they prefer large- meandering designs that do not detract from the quilt itself.