Final Fantasy versus XIII as a title is unimaginative.

[Ryu-Kentoshii Hirokima]

Agito befuddles me though... I have no idea where that word came from. I could look it up, but I'm lazy right now.

Agito:
Latin, meaning: to put in motion, move, rouse


Agito:
`Agito` may refer to one of the following: *Agito (symbol) (meaning `I move` in Latin), a symbol used by the International Paralympic Committee *The videogame `Final Fantasy Agito XIII`
** Japanese fictional characters: **The title character in the tokusatsu TV series `Kamen Rider Agito`
***Another Agito, a different character from the above series
****Wanijima Agito, a character in the `Air Gear` anime and manga series

Versus:
Against, in opposition to; compared with, as opposed to