Of the two proteins present in cows' milk, Whey is more soluble. It is digested more efficiently, allowing the cells in our muscles to access the essential amino acids more quickly and begin the process of rebuilding and repair. IF you take your protein supplements before a workout, Whey protein is more readily available as your body begins the process of regenerating lean muscle tissue. This ease with which Whey is digested is one of the reasons it is so commonly used in infant formulas. Additionally, recent studies have shown that Whey, compared to Casein, is better at promoting the body's sensation of satiety, or feeling of fullness.
It's high concentration in human milk:
http://www3.interscience.wiley.com/journal/119986807/abstract?CRETRY=1&SRETRY=0
It absorbs faster:
http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=909564
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