This one here is a big can of worms! I'm sure there is a great wiki on this site somewhere that someone could refer you to.Pure, Best, Finest, Silver-tip = whats the difference in badger brushes?
Is one more advantageous than the others? What are preferences?
An image showing the differences between Pure, Best, Silvertip, Manchurian and High Mountain White knots:As you can easily see, the differences are immediately obvious.