Ah, now here is an interesting debate.
I personally prefer FFT's smaller, 5-man battle groups over the 10-man ones of Tactics Ogre (I think it's 10). The battles in TO can really just be too big, and tend to drag on, though it could be a good thing depending on how you look at it.
I also think that FFT scales better as you go along, since TO has you literally grinding XP just so you don't get wtfpwnt at the next battle. Additionally, I find TO to be at a HUEG disadvantage for having non-rotatable maps, though it does get points for having much bigger maps. I can't comment on the story, because I only ever played about 1/4 of the way into TO, but it did seem interesting.