Well I just finished the GBA version, and it feels pretty good. I didn't have the fancy weapons like Ragnorak, Ultima, etc, but my strat was fairly sound, and I had a super easy time. Basically, I leveled every single character up to between 70 and 75, and I made each character a caster, no melee attacks from anybody. I made sure each character knew Ultima, and just spammed the hell of out that spell, and only that spell (as far as attacking went) I of course threw in a Curaja when needed. That's it really, seems cheap, I know, but hey, whatever works.