I will say i love the powder bark but there is a difference in yields for me as to the times I grind it up myself is always a little more.  Maybe something to do with them mass grinding it up and then it looses some in the packaging of it idk.  I will say you can smell it when you get good fresh potent bark though.  All this said when I buy more I’ll still get powdered as it is cheaper then whole bark now and the time saved is well worth the small loss.