For the most part people gravitate towards cows milk unless there is an issue digesting it. There are alternatives such as soy, rice and almond milk but if you are starting a homestead you may want look into goat or sheep milk. Goat milk is definitely more popular, but both sheep and goats have smaller fat gobules than cows so their milk is found to be easier to digest.
Here is a quick chart comparing sheep, goat, and cow milk. You will notice right away that while sheep milk has more protein it also has more fat compared to cow or goat milk. Sheep milk is also way higher in calcium.
I hope you find this chart helpful.