The best, in my opinion, would be FF6.
That game as well holds the title of my favourite game in general.
Tales of Phantasia was brilliant, as well as the allmighty Link to the Past.
Other amazing SNES RPGs would be Earthbound, Harvest Moon, E.V.O, Super Mario RPG, Breath of Fire series, and the Lufia series (although I'm not a fan of Lufia).
