How does whey protein compare to other proteins?

Protein foods are not equal and can vary in a number of ways including the following:

Number and quantity of essential amino acids
Digestion and absorption rates
Fat content
Taste
Purity

Whey protein is a very high quality complete protein with rich amounts of all the essential amino acids. Whey protein isolate is the purest form of whey protein, which is why it is absorbed so quickly and efficiently into the body.