[Mune]

Story, X.(XII's characters didn't develop well)
Gameplay, XII.(X, had turn base...not active with atb like the rest of the FFs. XII you could see your enemies approach you)
Graphics, X.(XII wasn't too flashy. Some of the areas were kinda weird)
Fun Factor, XII.(X had too many tedious sidequests)
Non-Tediousness, X.(XII had that Zodiac Spear...which you only knew about if you read the guide or had help. You opened one treasure you weren't supposed to, no Zodiac Spear for you! How would anyone know without a guide?)

In the end, I'd go XII. But, I'd never consider playing through either again due to how long they are and how much other crap goes along with it(sidequests) I liked the new feel of XII's battle system. Seeing enemies before they attack and what they are using.