Here is a list of pros and cons:
Pro: Finally explorable areas
Beautiful Story
Graphic
Improved Crystarium
Monster Breeding yes you can catch monsters and used separately in the fight
You get back Gil for winning fights
Cons: Unfortunately still the paradigms battle system
So and now a few words about the Limited Edition, it has also been more successful than its predecessor, the package is considerably more stable, the content is almost identical to its predecessor, but for fans of course a must, so I hope I could help in the purchase decision.