The greatest deficiency of pea protein powder when compared to whey, is that it is not a complete protein.
Comparing hemp protein powder to whey is a bit like comparing apples to oranges. While they are both protein powders, they are quite uniquely different.
Casein protein powder cannot really be compared to whey, as both protein powders are quite unique from one another and suit different purposes.
Unfortunately soy protein powder does not provide the same capacity for muscle development as whey and other animal sourced proteins.
"Egg Protein Powder" versus "Whey Protein Powder" is a hotly debated topic among some athletes.