I personally would say that you should buy whatever protein is cheapest and you can stand the taste of it. I really don't think there is a big enough difference between any of them to matter that much ... especially not for a beginner.
Are you an absolute beginner? IE: No lifting experience? If so, I would suggest starting with a 3x a week full body workout focusing around bench, squats, deads, and military press. Also, some good quality rowing, pullups, chins, and core work would be good additions there. Obviously you shouldn't do all of that every day. lol
IW
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