Here are the statistics from the Mounts and Other Animals Table in the DMG:
|Pony||30 gp||40 ft.||225 lb.|
|Donkey or mule||8 gp||40 ft.||420 lb.|
The pony costs 30 gp, and can only carry 225 lb.
The mule costs just 8 gp, and can carry 420 lb.
Both have the same speed, 40 ft.
I'm wondering why someone would rather buy the pony, when its nearly four times as expensive, and can only carry about half as much weight?
I would have expected the mule to be more expensive than the pony given these stats, not less expensive. Is there any amazing advantage of a pony I am missing?