I put XII because of all the hunts and sidequests you can do after the story ends. I've spent at least 50 hours on those alone, I'd wager.
X had a of really fun endgame too though, if you don't count blitzball. Monster Hunting, Celestial Weapons, Omega Ruins, etc.
The other final fantasy's endgame just feels lackluster in comparison, and I can't make a call on 13 yet, since I'm still only in the Fifth Ark.
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