I have shot a lot of both Graf's and Goex. Also Wano and Schuetzen. All are very good powders. As for fouling, they are pretty equal. As is their power. So the only real difference I ever found is price and availability. For a while, Goex was hard to find. It has something to do with an explosion in a factory. So I went to Grafs. I liked it so much I stuck with it. The Graf's, Schuetzen and Wano are made by Wano. And the Schuetzen powder I purchased, the American pour spout did not fit tightly on the plastic jugs. So I have to pour the powder into a Graf's or Goex can.