I played all FF except the original Tactics and XIII, but I saw the entire XIII played by my BF so I kinda feel I played it too. I loved all of them, even FFX-2, being FF2 the less loved due to the strange spell tier system. It was kinda irritating to see Cure level up and cost so much mp. FFVIII is also for me not on the top because the villain changed so many times. Edea was bad, then good, Seifer was bad but you learned he was brainwashed. Then all of a sudden Ultimecia appears and you should hate her because she was the reason of all. And Adel... I was used in all FF to hate the villain like in FFVII I couldn't wait to get to the crater and smack Sephiroth.
FFX was awesome, made me cry, great battles, great extras and music. FFIX also made me cry, the ending was unexpected. FFVII was my first and I remember saving right before Aerith gets the hit so I could replay it every time. FFX-2 was too Barbie, and the story was a bit forced but I still loved the job system and the extras that made you replay it to get 100%. Why Tidus really comes back is a flaw to me but well...
FF11 got me hooked for 5 years, "nuff said".
Prolly my favourites of all might be the most adult ones, from FF10 onwards. FFXII is one of my favourites, story is amazing, and each character is very well defined. No more lil princesses, no more kids trying to be the main heros. The only thing I missed was the summons who were useless but still fun to get. FFXIII is also great to me, I did get bored sometimes watching my BF playing it for all the tunnels and endless areas, but the story was rewarding.
I couldn't position all of them in a top chart, because all of them make me play them again and again. Some have maybe less gaming power but on other hand a big story to be told, or other way round. Maybe today I want a growned woman to fight for her kingdom's freedom, but tomorrow I just want to be a girl who needs to be rescued. Anyhow all FF are special to me and their stories never to be forgotten.
Edit: I left out FFVI!!! I should have no cookies today
Awesome adult story, nothing was like it seemed, great crew of characters, abilities, summons, music. I never got to have all summons sadly, so I might give it another try.