Personally I lie in-between A & B. I want more than one mount, the ability to have an aesthetic choice is a very large factor in MMOs these days.

On the other side, I don't want every mount to be able to partake in the battle aspect as Chocobos are slated to do. Maybe a couple mounts that can be customized and used in battle, and several aesthetic mounts.

I can see the current zone you're in playing a role in which mount you choose to use.