Maybe I’m over thinking this. XD But I would chose whatever would be most useful to my ‘special talent’. So I’d go with Unicorn. You can’t go wrong with magic! I feel like it’s the most ‘versatile’ when it comes to cutie marks. You can use magic to help you do just about anything! When I think of what my ‘special talent’ would be, it makes the most sense to be a unicorn. I plan on owning an event planning business someday, so I can see myself having abilities similar to Rarity’s….being able to levitate objects, multitasking, being able to clean up without lifting a hoof.
I would be a Pegasus, but every time I watch Rainbow Dash up in the clouds, I just can’t help but think of how cold she must be up there! I don’t do cold very well. Plus, I’m not that interested in controlling the weather. As cool as it would be to fly, it wouldn’t be as useful to my ‘special talent’ as magic.
As much as I love earth ponies, I wouldn’t pass up the opportunity to have wings or magic! I don’t think anyone would, really. Unless you were like Applejack and was super passionate about farming or manual labor. I’m lazy as hay though, so I would make a pretty weak earth pony.