The best protein powder is always going to be the one that works best for you. Everybody is different and everyone reacts differently to different protein powders. It really is a case of trial and error and it took me probably around 4 different ones before I came across one that I liked and worked well. So which one should you start out with if your looking to pack on some good quality muscle, Well I would definitely suggest you go for whey protein, most of the proteins out there now are whey simply because people like you and me have seen how good it is and have demanded that that is what is stocked. Around 70% of protein powders you are going to see on the shelves now are whey but that is a good starting point, get whey. The reason you should get whey is because it gets absorbed into the body much much quicker than normal proteins and as such your muscles get the benefits of it straight away. As such you should try using it as a post work out shake so that your muscles get the maximum hit of protein straight after you have worked out. This is when they need protein the most and then you increase the likelihood of positive muscle growth. Some of the best manufacturers of Whey protein for me are Maximuscle as they do some great ones and also Myoplex is pretty good too, but remember what works for me might not work for you. Do some research and make your own decision about what one you are going to try first and remember when you find one that works buy it in bulk to save yourself a load of money. The best protein powder is the one that helps you put on mass. Combine it with other supplements such as nitric oxide supplements and your onto a winner