Quote Originally Posted by Zantetsuken View Post
The true variety in mounts will be in the Chocobo breeding/raising system. Chocobo will be bred for increased speed, digging, item carrying capacity, battle skills and many other abilities. If you want variety of ability, for mounts, this will be the avenue for it.

It appears that all other mounts will be functionally identical to each other. They will just be in the game for looks/vanity. (much like Goobbue is now)
We shouldn't forget that those mounts also have custom music pieces...