Like I said, from a purely isolation standpoint, the Roxul will do a little bit better. From an in-room performance standpoint, not much - unless you can fill the whole cavity above the drop with std insulation rather than just say 4" of Roxul.
Which are you trying to accomplish? Isolation? If so, one easy and relatively inexpensive way to go is to simply cut drywall and glue it to the underside of the subfloor above. That will increase the mass and reduce the transmission while only reducing the cavity depth for insulation by 1/2"
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