The best powder is Swiss of course. I used Schuetzen powder before and prefer it over Graf's or Goex. I know Wano makes Graf's and Schuetzen but I am not sure they are one and the same. A lot of time powders are distinguished by the kind of wood they use to make the charcoal for the powder. Although Goex, Graf's Schuetzen while are about equal, I still picked Schuetzen. But here is something that might influence your pick..
I had a telephone conversation with a forum member yesterday about powders. And he mentioned that Swiss no longer accepts the metal or plastic pour spouts. So out of curiosity (and having gotten my case of Schuetzen in the same day.. checked one of their bottles and low and behold.. its metric. The caps don't fit that either. But I think if I teflon tape the threads, I can get a tight enough seal to work with the bottle...
Also I shoot more 2f then 3f. I just like it better.