Who makes the highest quality water color brushes?

Answer 1

The quality of WC brushes is in the fiber used. Kolisky Sable is the best, and so expensive that every mfg takes great care to make the best brush they can. You have to try the individual brush with water at the store before you buy, so you have to know what you're doing with water colors.

I usually pick a Winsor Newton but have several others also.

Answer 2

Windsor & Newton