Open Question: Best brand of protein powder?

In your opinion whats the best brand of protein powder to help you build muscle? Please list some reasons and your favourite flavours. I just bought the Allmax nutritions Isoflex? Was that a smart choice? And Is Optimum nutritions gold standard 100% whey good? Or what about Dymatize Elite whey. They both come in natural forms with no artificial stuff, would that be good? thanks.