For me:
Never buying again-
Lightfoot's Pure Pine soap
Herr & Man soap
Aqua Di Parma cream
Probably won't buy again-
Mitchell's Wool Fat soap
Any Van Der Hagen soap
Current formula Williams soap
Interesting. MWF is my favorite! And I use VDH deluxe as a travel soap.
Hardness or softness of water and stiffness or floppiness of brush is a factor, I suppose.