VII and Vi, huh? Well, the second half of 6 makes more sense than post-Whirlwind Maze 7, but Sephiroth is marginally better-filled out than Kefka. Both battle systems are equally wonky but exceedingly playable, the score for both is extraordinary, but 7 gets Chasing after the Black-Caped Man, J E N O V A and Great Warrior, although in its favor 6 gets a graphical style that has probably aged better. It's all moot, anyway, because:
GOD TIER
Final Fantasy IX
Final Fantasy Tactics
SILVER TIER
Final Fantasy VII
Final Fantasy VI
Final Fantasy X
Final Fantasy VIII (I love and hate it for its radical rejiggings of the RPG system - junction is such a great idea, it's all the more crushing when it becomes so horrifically broken)
BRONZE TIER
Final Fantasy IV (good game, but is it *great*?)
Final Fantasy V (Ah, Butz, I knew him well. Paper thin story but 1337 battle system and cool music thanks to Uematsu)
Final Fantasy - Tactics Advance (core mechanic is great, no story though, loses place in silver thanks to THAT BLOODY BLACK THREAD MISSION ITEM)
Final Fantasy - Tactics Advance 2 (FFTA - story + better balance - repetition = FFTA-2)
TWIGS AND LITTER TIER
Final Fantasy XII (HAHAHAHAHAHAHAHAHAHAHAHA. No.)