The small brush knots consume less soap, leaving more for your face(or head), which also means you can use better product for a longer duration.
Hahaha. FWIW, I still haven’t burned through a PdP63 puck bought in 2018…, but my favorite knots tend to be 16mm-18mm.
my favorite badgers seem to be 20 -sh 2 24..my simpson special 1 best badger rteally punches above it's weight..fantastic lathers..