Its not worlds different, but my favorite TGN knots are the 22mm super silvertip (not the Super Badger), and the extra stuffed finest 24mm. The super sivlertip is noticeably softer than the grade A. The backbone seems a bit lower, but if you set it low you still get a great brush. I have mine set at 44mm and its a great little face lather (sliceOfLife preferred his at 41mm), but at 48 it was a very luxurious cream brush.
Then the 24mm extra stuffed finest feels much more dense than the 26mm extra stuffed, so I'm assuming its even more different than the vanilla finest. I have my 24mm set at 50, and its just fantastic.
Another option might be the boar hair knot. I have not used one, but I have almost purchased one several times out of curiosity.
"Loric=Ernest Shackleton of SBAD" - Krona Kruiser