some ppl are concerned that powder allows more O2 to get to it, creating more oxides. BUT as long as its a trusted supplier, and you know they ground it up recently and you intend on using it quickly i see no reason for that to be an issue.
basically, if i'm doing an extraction, ill buy powder and use quickly
if i'm stocking up for the Apocalypse, ill buy bark and vacuum seal, and freeze.
Who's this SWIM person and when do I get to meet them? They sound friken cool!