It's hard to say which battle system was my favorite. I liked FFVII's Materia system, and the battles were quite fun in the game, but FFV's gameplay is also awesome with the addictive Job/Ability system. I also like FFIV and FFIX's systems of having fixed classes, so you can no longer make your characters carbon copies of each other, with everyone doing 99,999 damage with physical attacks and also bein able to heal, use black magic and summon monsters at the same time. I also liked FFX-2's fast ATB battles, and FFT's system is a lot of fun as well, it's like FFV's, though the battles are a lot more tactical since they aren't ATB.