According to the book “Fast Food Nation,” until the refrigerated box car became common in rail service, after the 1920s, pork was the most eaten meat.
I grew up on a farm and I can tell you pigs are by far the easiest to raise. Sheep are very easy as well, but they suffer from centuries of domestication which makes them very stupid, prone to disease and predictors.
Losses to sheep were a real problem in the past, (still are but not to the extent they once were).
Chickens were raised in the city but pigs are easy to raise, they can be quite nasty so a predator will think twice about that.
I would say goats are harder than pigs but easier than sheep, as they aren’t as stupid and can protect themselves.
The meat depends a lot on which they feed. I’m not a fan of mutton, though I like lamb. Goat meat can be very strong or mild, depending on the breed type and food it eats.
Goats can also be mean and nasty depending on the breed and how they’re raised and handled.
But the only reason we don’t eat more of it, is there was no call for it.
Goat milk is good, but they don’t make (or haven’t been bred to) milk in huge quantities. One goat can serve about two people for milk. And goat milk is good.
But then why don’t we eat more goose, or even swans? Swans are nasty, even more so than geese, but I’m betting that that is because they haven’t been domesticated really.
But then look at why are gluten free products so expensive? Rice, which makes up a lot of the flour (rice flour) is cheap. You can make rice flour yourself cheap. There just isn’t a lot of demand.