I'm a big fan of the cellulose. I am amazed at the performance, wont burn, mildew and resist pests. Foam is supposed to be even better. Foam you can blow on ceilings where as cellulose you hang the rock on the ceiling and than blow, foam IMO is a better way to go for that. May have to just price it out and make the decision from there but one thing is for sure, fiberglass is so inferior to foam and cellulose, The last thing you wanna do is compromise on insulation.