Which one should I be drinking: soy milk, rice milk or cow's milk?

I am so confused by all of the "milk" choices, and am not sure which one is the healthiest? I do not have any allergies or intolerances to dairy or soy. All three of these items (rice milk, soy milk and cow's milk) can be bought organic, low-fat, with no added preservatives or growth hormones (for cows), etc.

Are they all the same in calories, sodium, vitamins, minerals, etc? Are they all equally good for my skin and bones and overall health?