One of the big reasons why FFVI never stood out to me is because I made the mistake of playing it after finishing Chrono Trigger. CT is a superior game in almost all of those categories, although the all-Nobuo soundtrack of VI might win out in the music department and I thought FFVI had superb customization and dungeon design, so it might also win out on the gameplay front.

You should know the King of SNES RPGs is Dragon Quest V, though, FL Or Tactics Ogre...