Real Milk or Muscle Milk

I recently purchased a 1 quart container of chocolate milk for a post-workout. That is 4 cups of chocolate milk for $1.79 in my local Target Store.

For that price I received.

Calories 880
Fat           32 grams
Carbs     116 grams
Protein     32 grams

versus Muscle Milk RTD 17 fl. oz. at about $3.99

Calories 340
Fat           16 grams
Carbs       16 grams
Protein     34 grams