Our white chalk is specifically blended for climbing to keep sweat at bay, ensuring maximum grip no matter how hot or humid it gets.
Posted by Beau McGuigan on 16th Jun 2011
Chalk is chalk really (and there's only two real choices, the old calcium sulfate or newer magnesium carbonate).
Powdered is not quite as good as liquid chalk which stays on the hands a little longer, however I personally find powdered easier to colour to match your environment (perfect when you want to leave a climb looking pristine for the next group).
Bottom line, it's chalk. They all do the same thing essentially and there's not really any improvements to be found one brand to the next.