For muscle building purposes, then, stick with whey protein concentrate. (blog.nkdnutrition.com)
There's an ongoing debate about whether whey or casein is better for muscle building purposes, but here's what most reputable experts agree on: (legionathletics.com)
This makes it great for muscle building purposes, and when you combine pea protein with rice protein, you get what's often called the «vegan's whey.» (legionathletics.com)