If you believe the ads, cowsâ milk is a powerhouse product, capable of unsticking a peanut butter mouth, making white-mustachioed celebrities look health-chic and building strong bones. But isnât soymilk better for your heart? And goatsâ milk easier to digest? And arenât rice milk and nut milk skinnier? The fact is, milk drinkers have never had more options or been more confused. Here, how to sort out the healthiest choices for animals, the planet and you.