Horse breeds, traits, skills and geographical references

The worlds don't have any influence on Horses, but Chestnut Ridge is the most adapted in terms of routing and convenience (you find obstacles, barrels and prairie grass scattered in Chestnut Ridge but not in other worlds, for instance).

As for routing, In mount Komorebi for instance, Horses can't access the trail with the red Temple and bamboo forest because it has stairs leading to it, but they can access the trail in the Snowy/Ski resort area. Also some worlds have much smaller neighborhoods than others.