Rockwooo and cellulose are not the same, rock wool is much denser when installed and less likely to sag in the wall. Also cellulose is flamable ( they say it's been coated with a fire retardant but at the end of the day it's news paper..... Flamable) . Blown Rock wool is way to go , only down side is u have to wait about a week for it to dry before u sheet rock , they suggest only waiting a few days but I've found it still damp after 2 days so I wait 5-7 days. I'm getting ready to insulate 2 houses in the next couple weeks if you'd like u can come watch the process
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