Casein offers protein balance. This makes a "gel" material in the stomach, which causes the digestion to be slow. This results in a slow release of amino acids into the blood stream. Making it the ideal "night" protein powder. Anti-catabolic is the name of the game when it comes to overnight digestion. Whey should be taken post workout. Before and after if you perfer. This gives a rapid increase in amino acids. Repeated doses throughout the day allows your body to sustain proper levels of amino acids. This makes it almost imperative to take post workout. Almost shooting yourself in the foot when you miss your after workout dose.  When taken together, it has huge benefits. You get the best of both worlds. Rapid increase of amino acids from the whey, with the slow digesting effect from the casein. This is good when you dont plan on eating for a couple hours before or after your workout. The biggest difference between them is there speed of absorption. Digestion of protein is important for protein balance. Whey gives the "quick burst" of protein, while casein sustains long period of protein break down. With these differences, they can be used alone or in combination to take advantage of there unique effects. I take both types and use them in different parts of the day. Whey for post work out, casein for my "night" meal. These both support the increase of lean body mass and decreases body fat in a training program.
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