In terms of price, quality and performance I think the Colonel with a Best knot can’t be beat. If you’re able to throw more money at it, the Tulip 2 with a Super knot is a formidable brush. Putting price aside, my favourite Simpson is the QE II Jubilee with a Manchurian knot; alas this was a limited release several years ago and is only available now in the aftermarket if at all. I’ve had other Simpson Manchurians, but the Jubilee is unique and much better.