What protein powder to use?

You want to stick to the reputable brands. There have been instances of false advertisement on the protein powder. I.e. American Pure Whey is absolute garbage. A reddit poster has tested several big brands to determine the actual protein content.

Source:
https://www.reddit.com/r/Fitness/comments/31volk/we_sent_samples_from_famous_whey_protein_brands/
https://www.reddit.com/comments/uva9t/big_reddit_protein_powder_measurement_results

I use ON's Gold Standard Whey. Lots of flavors, and they are usually excellent. Very reputable and high quality ingredients. Currently on a 5lb Cappuccino jug, and I'm very happy with it (previously strawberry, and double rich chocolate before that, all excellent!).

You want to stick to Whey protein as well - it's the cheapest and the best. Whey Concentrate first, or if that upsets your stomach, then Whey Isolate. DON'T get caught up by the sleezy GNC salesman of super-duper-treated-double-cold-pressed-isolate-casein-protein BS. A simple Whey Concentrate or Isolate is what you need.

"Whey is the king protein, period. It’s better than the 100 dollar fish protein from a certain manufacturer who is big in the land of shirtless dudes and vibram 5 finger clad women. Why? Because its amino acid profile is better, i.e. it has more BCAAs (leucine/isoleucine/valine) and a higher concentration of essential amino acids. Also, it’s cheaper…so that seems to be a good point in and of itself. Whey trumps casein on satiety, MPS rates, and time that it keeps plasma (blood) amino acid levels elevated. In other words, all the nonsense the bro at GNC regurgitates about casein being a slow digesting protein that is good to take at night because it slowly releases amino acids from the GI tract is BS. [...] Also, whey keeps you fuller, longer (satiety) than casein, and it’s CHEAPER. Yep, whey is better than egg protein, beef protein, hemp protein (sucks), rice protein (sucks), pea protein (double sucks), and soy protein (double sucks). Whey protein concentrate, one of the cheapest options out there is where everyone should start for whey supplementation. If it doesn’t upset your GI tract, then stay there and never look back. If it does- and it will in some who are sensitive to an amino acid fraction (beta lactalbumin) – switch to whey protein isolate, which has this fraction removed. "

None they mess u up in the inside and dont work as they always say only works 5-10% your best bet is whole foods

http://scoobysworkshop.com/top-5-best-protein-powders/