I played a bit of FF X myself. I always liked using the gunner form for my characters, though I doubt it really made a difference in terms of damage. I only played up to the first boss, really, but I still enjoyed the game for the time I had to play through it.
but they were so coooool! dark knight called down meteors and could go out in a blaze of stupidity and blow themself up to annihilate people! and berserkers were like kitties that did awesome back flips XD