An interesting article by WebMD about milk and the nutritional content of each. Below I posted three out of the 16 they wrote about; the three I see people mention the most as far as alternatives are concerned, however, I strongly recommend reading all of them.
#6 Goat’s Milk
In the plus column, a cup of this drink has tons of protein — 9 grams per cup, the most of any milk. It’s also richer in calcium than skim, with 33% of what you need each day. The cons: It has 168 calories and 6.5 grams of saturated fat per cup, far more than whole cow’s milk. One study found that it had no clear nutritional advantage over cow’s milk, and if you’re allergic to cow’s milk, you’ll probably be allergic to this as well.
#8 Almond Milk
Made from ground almonds and filtered water, one cup of almond milk can have fewer than 30 calories while packing 450 milligrams of calcium. That’s more than most cheese, yogurt, and soy milk. Keep in mind that the benefits don’t come close to what you get from an ounce of raw almonds, which have far more protein, fiber, and healthy fats. But it can be a good choice for people on a low-sugar diet, those with a dairy or soy allergy, and vegans who don’t like soy milk.
#12 Coconut Milk
It’s not just for pina coladas and curries — coconut milk is everywhere these days. But know the differences: Canned coconut milk is the liquid expressed from coconut meat. With 36 grams of fat per cup, it’s the nondairy equal of heavy cream. It’s a great substitute in soups, puddings, and vegan ice cream. “Coconut milk beverage,” found in the refrigerated section, is watered down to lower the calories and fat. One cup has 45 calories and 3.5 grams of saturated fat.