I now have both. And, so far, it seems the Supercollider (the one with the mids switch and not knob) is winning. The Bass Big Muff doesn't seem to have "it". but then again, the "it" could be had by putting the XXL in series with the Supercollider. Don't get me wrong, there is something sinfully loud and nasty about Supercollider >BBM in "Dry" mode, but I will explore this later this week. Further bulletins as events warrant.