No... it doesn't matter a lot imo, I'll buy it on PS3.
I loved final fantasy XIII. the way it was. not perfect (No Game is maybe this had more faults idc)
But the things that bugged me was not enough to do during quests. And barebones quests with not enough dialogue etc. Where the reskins on pulse (the battles were fun as hell for me) and lack it had cool locations just... they didn't talk about it. Not enough umph
And I think there should have been more branching paths or city buildings (like dead space)
But I'm not sure how much of that has to do with them running out of time than disk space... the xbox 360 used only 3 (I believe) FF8,FF9 used 4 discs just fine.
I mean the ps3 will probably look better with uncompressed fmv's, and maybe better if exclusive. But I mean I played the xbox a little and I still would have loved that version.