All FF have a handful memorable themes, but if we have to go with just the sheer number of "wow" themes, then that's blatantly FFVIII. It's not nostalgia or people would vote more for the one that's most beloved, FFVII. FFVII pales in comparison when it comes to quantity, I think also FFX has more memorable themes in total.
I mean, this is just a theme for a briefing, imagine the rest.
As for battle themes, I'm gonna have to say FFIX gets a nearly perfect score. Main theme is just okay, but then you have in a row
(FFIX has probably best generic boss theme of the whole series)
I wish I knew the FFXIV story because just like that, because you can tell if the themes fit or it's just unnecessary orchestral for the sake of it, like the great John Williams themes in the stupid videogamey Star Wars prequel battles.