They have both weaknesses and advantages..

I say that.. in

FFVII: The story is more interesting and Longer than the one in FFXII.. the battLe-system is great and I Love the "materia" thing.. The characters are amazing and got a great Life history or side story.. :-)

On the other hand..

FFXII: Got a short story and an unsatisfying ending.. BUT.. aLL the Animations there that you can see are great and enjoyabLe aLso.. you may say that Espers are quite not important and weak.. because of course, you don't get any advantages getting them.. but just unLocking them in the License board and have the chance to summon them.. aLso one of the Espers are part of the story.. (BeLias) since he'LL be the key to open a door.. Leading to Giruvegan..

Be aware that.. summoning Espers are not quite a good idea especiaLLy when you're in the way of LeveLing up.. because the one who summon that specific Esper is the onLy who'LL get the EXP. from the monster that the Esper or the one who summon that Esper kiLLed.. Mmm.. the Animations when you summon Espers are impressive and their attacks and DeathbLows are great too! And.. there's many sidequest that you can do in FFXII just Like the "Hunts" job.. etc. that's the advantages of FFXII in aLL FFs.. :-) The characters here, got a weak side story.. and very.. boring.. I think.. the most interesting characters are onLy three.. Basch, Fran and BaLthier.. for me..

Anyway.. aLL in aLL.. both games are good in a different ways.. and you shouLd get FFVII aLso! The License board is not that hard to compLete.. I compLeted cLearing it, when I got my whoLe characters to max LeveL.. :-) About.. near ending.. :-)