I think most members here joined before the release of FFXIII, so you mightn't get many answers. Most of the people I know IRL have both consoles now thanks to both price drops and the dirt cheap prices on the fatter PS3s and 360s when stores were phasing them out here. Most got FFXIII on PS3 as it was the superior version (it's kind of funny how much research we do into multiplats before buying), but I knew a few people that bought it on 360 solely as their gamer score meant a ton to them and they wanted the achievements.
To answer your question to some extent, those I know who bought it were previous fans of the series (some as far back as the glory years on Nintendo), and most of my other friends have no interest in games that aren't shooters and so have no interest in the game apart from one graphics whore.
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