So this is a hard pick for me. XII being my favorite, I wanna go with that one, but it's gotten some nice attention lately. A lot of people say IX's often overlooked, but that's been changing the past few years as well. I thought V was always kinda in that middleground of notoriety where hardcore JRPG fans love it, but most people (ie, the people who play for the story and characters) tend to overlook it, but on the other hand, it took me until last year to really sink my teeth in it, so I'll vote for it.

I also want to say maybe FFIII? I haven't played it, but its graphics and music are the peak of the Famicom, and I really want to give that version a try.