FF9 coming to iOS, Android, and PC sometime in the future. It's been announced. FF6 was the best IMHO followed closely by FF4, but I highly enjoyed FF9.
I mostly loved the FF series up to 9. FF8 is a soulless abomination. It had some good points but it was such a shitfest. I just couldn't like the emo loser main character. It just did not have a compelling story. And at the time, I had lots of free time and had played every single stateside FF game from FF1 on the NES on up. I paid money for this crap and just couldn't dig up the willpower to finish it.
Starting from FF10, the series starting going downhill in one way or another. I simply didn't find them as enjoyable.