All the Final Fantasies (1-3 for NES 4-6 for SNES), Chrono Trigger (SNES), Tales of Phantasia (I think this is the one for SNES) and Breath of Fire (1-3 SNES).

I would rank them like this:
Chrono Trigger
Final Fantasy VI
Final Fantasy IV
Tales of Phantasia
Breath of Fire III
Final Fantasy V
and then the 3 NES ones.

I may give a review for each later if I have time. You can probably find some online, though.