A basic video about livestock. He breaks livestock down into different categories, those which are easy to raise, medium, and hard mode.
Easy: Chickens, Ducks, Rabbits, Fish, Worms
Medium: Pigs, Min Jersey Cows, Turkeys/Quail
Hard: Sheep, Goats, Beef, Dairy, Horses, Alpacas
I'd be interested to hear any experiences people have had with these different livestock
I don't have in depth knowledge of most of these but I will say that that horses can be both be way easier than Cows and sheep or way harder depending on what you are going to do with them.
If you plan on training a horse for riding that takes way more time and skill than raising animals for food, however if you plan on raising horses for meat ( which most of the world apparently doesn't do) or breed them to sell, that is way easier than sheep, cows and I would argue goats since they are harder to keep in a fence.
Horses bite grass with their teeth while cows rip grasses up by wrapping there tongue around them, making horses more efficient grazers that can start grazing earlier in the growing cycle as the can bite closer to the root.
If the horses are free to run around you just have to feed them in the top of winter and then walk around them every now and then so they don't become wild.
Horses are also not that daring and its unlikely that a horse will attack you.
I would also like to add that most difficulties that come with the animals on that list won't scale up with numbers, it will be more time consuming but not harder, if anything you will become more efficient and develope better systems for said chores.