Like many others my first was FF7. However I didn't get very far in it since I was playing it on a PS2 and had no PS1 memory card at the time. The next one I played was the demo of FF10-2. It wasn't until many years later that I really got into the FF series proper when I started playing through 7, 8 and 9 at the same time while on holiday as an adult.

7 and 10 are currently tied as my favorites. 9 is okay, I liked the story and characters but the gameplay was mediocre at best. I hated 8 when I first played it but in retrospect I think it's a pretty cool game, and I would sooner take twenty more games like it than another 13 or 15. Played about a dozen hours of 12, didn't leave much of an impression on me, maybe I'll enjoy the Zodiac Edition more. I'm planning on tackling the SNES games once I've finished Lost Odyssey.