Quantitative measurement for sound dampening methods
The overall construction method makes much more difference than the type of insulation. It seems intervening air gaps in assemblies is usually beneficial so batts may be more beneficial than blown in, given identical material. All just a guess on my part. Acoustics can be maddeningly illogical.

Some time ago California compiled acoustical tests from various sources into a catalog of sound-rated wall and floor/ceiling assemblies.