Best Creatine powder?

So I've just purchase BSN True-Mass that I will be taking post workout. The question is, I have spare Creatine AMP 189 from GNC which hasn't really been working to well for me. I'm planning on taking a serving of Creatine before, and then a dose after, along with the BSN True-Mass. However, I'm wondering which Creatine product would be the best to replace my AMP 189 that I have right now?