This, the other games with there characters and settings does nothing for me (haven't played XI) and are in fact my least favorite FF games overall.
You should also try X and/or VI imo.Three? I only like FF7R.
The online ones, 11 and 14, are out.
12? nothing memorable.
13? Lol
15? Err... good testbed for wetting your feet with open world mechanics and your new hybrid of action and traditional battle system? Shame about the barely finished game.