Camels, they can dash, walk over fences, and Huge! They're also adorable and asthethically pleasing, aswell as being fast as a horse when pressing the sprint button. I like the Illagers aswell, mainly because they look slick and have interesting lore, the raids giving decent rewards, and I really like the Ravagers bull like design and how it extends its neck to ram its target.(my favorite Illager would be the Iceologer, cuz it has an interesting attack and design, sadly its not in the game)

Donkey

The Giant Def #changemymind

For in game utility probably the villager; for aesthetics likely the horse

The axolotl B)

Edit: actually... the GOAT!