For the sake of brevity:

Graphics: were astounding and really quite awe-inspiring. Though at times it appeared somewhat grainy, there are many enviremonts that are truly beautiful and express the deep thought and work put into creating a whole new world for fans to immerse themselves in.

FMVS: were shorter, on average, than that of X. However, X's were not always on the scale that XII's were (see the opening sequences of battle and the like). really, I don't think one or the other has the "better" FMVs.

Story: they're almost completely opposites. One is close and personal, whereas the other's is of political intrigue and the like. Which one did I enjoy more? X's, because I am a sap, but the deviationfrom such a story in XII was quite refreshing.