Minecraft wiki entry for Best_enchantments_guide, associated text: You are more likely to hit another mob with Multishot or the same one when its a larger mob, but the chance that you hit something else unintentionally increases with both enchantments (a villager to make an iron golem angry or a zombified piglin or bees). Piercing allows reusing arrows which hit a mob, so it almost substitutes Infinity, and it can be useful for achieving certain advancements‌[JE only] or killing at spawners. Piercing is usually better because you use less arrows, and with multishot, you can only see where one arrow will land, not all three. Also, Piercing uses 1 durability per shot, while Multishot uses 3; more precious ammunition such as tipped arrows can also be retrieved after use, which is a benefit that Infinity doesn't have.