Me and I'd guess lots of other shooters, 300 BLK subsonic is quiet and makes for a neat toy, but the full power chamberings are all around far more useful. I'd guess that the majority of my supressed shooting is done using a 6.5 CM and a 5.56, with the balance being .30-06 and .308, so numbers on those kinds of hosts are most interesting to me.
I'm excited to see Suppressed Nation's back to back testing, they used a few B&K 2209s and will have numbers, muzzle and ear, same day/same host for the Vox, Trash Panda, Omega, Nomad, and, I think the Resonator. Their videos have been getting better, and better, this one should be the most interesting yet due to the scope and scale of the direct comparisons.