So far, for me, FFXII > FXIII by some considerable margin, and for many reasons. Primarily it's the gameplay options, voice acting (by the gods Vanille annoys me, and Snow and Hope aren't much better), and the music (Sazh's funky jazz annoys me, in particular). Unfortunately, I really dislike several aspects of FXIII, which is bringing it down for me. Particularly, the interaction options (loiter by a person and strain to hear what they are saying), the tunnels of combats and cut-scenes for the majority of the game with nothing else to do (I WANT MORE SIDE-QUESTS!), and the easiness of it all are tainting an otherwise great game. Y'see, FXIII has much I like as well, including the battle system that has grown on me quite a bit (even though it is a little too easy in most situations -- I've 5-starred almost every battle), the breath-taking environments (and without slowdown or a single screen-torn, no matter how much is on display -- nice!), and the fact that Lightning is Liara from ME and I didn't realise for, I dunno, about the first 40 hours of gameplay.