Well I know koxx brown are amazingly good.
I have now tried them for a few hours of riding on a shit grind and I have to say the hold is pretty.
As I have a booster I really don't get much noise, which I am happy with.
And no, if you have a decent sharp grind I really wouldn't recommend tar as they work very well.
So yeah Sharp Grind + Koxx boxx in cnc backing = Crazy good