Having played all FFs except 5 I'll always maintain that IX was the best, but like many with FF7, 6, 4 etc it was my first JRPG so it had a lasting impact. I did play FF7 shortly afterwards and really didn't find sephiroth to be a very compelling villain, not sure what the fuss is all about there.
Yes, I prefer the guy with the thong, I said it.
Also, fuck racial representation in FF7, 9 had quina representation
http://images.wikia.com/finalfantasy...Quina_Quen.jpg
Edit: As for XV, I'd really like to see it soon but I'll settle for XIII-3 for now if it continues to improve as much as XIII-2 did over the original. I'd rather not see XV till we're within 2 years of it coming out, if that's not the case already.