I guess ill take the time to put together a real list for myself...Im not including Dissidia, and I havent played any older than 7, 12 or the MMOs...im including the number of completed playthroughs and platforms played because that feels relevant.
1) FFVIII - at least 5 on PS1, PSP, PS4. the first FF I ever played, changed my perspective of gaming as a whole. also has the best music and world in the series IMO.
2) FFXV - at least 4+DLC on PS4 Pro, Xbox One X. put too much time (and money) into it to not love it, also was my most anticipated game of all time. I love the blend of a somewhat modern world with fantasy elements.
3) FFVIIR -at least 1 on PS4 Pro. its great. Im hoping they intend to patch the game to improve quality in the slum areas because its noticeably a step down from everything else. Combat is the best.
4) FFX - at least 3 on PS2, PS3. felt revolutionary at the time. looking back I think this is the most incredible looking one from an artistic perspective.
5) FFIX - at least 2 on PS1. put off playing it because it looked so unlike 7 and 8, but loved it when I did. probably has the best story. Its very well rounded and good in all aspects, I just prefer a more modern look.
6) FFXIII - at least 3 on PS3, Xbox One X. didnt love the futuristic look of much of it because its too sci-fi... but the visuals, music and battle system is some of my favorite.
7) FFX-2 - at least 3 on PS2, PS3. it was weird even hearing about a "2" to a final fantasy "10" but I really enjoyed going back to spira and the game had a unique feel anyway. battle system was so good.
8) FFVII - at least 1 on PS1, PS4. if I played this before 8, im sure I would feel how many others feel about it, but the fact is I played 8 first...playing 7 felt like going backwards. No matter how good it was I always just felt that way.
9) FFXIII-2 - at least 3 on PS3, Xbox One X. Its a really good game, and in many ways is what people wanted out of 13. Crazy ending. I feel like this game did more than people give it credit for.
10) CCFFVII - at least 1 on PSP. I bought a PSP for this and Dissidia.. did not like the battle system but loved the story and cutscenes.
11) FFTYPE-0 HD - at least 1 on PS4. I really hope they either to a sequel to this, or 16 takes a similar approach...but this game felt violent in a way you dont see in most FF's.
12) LRFFXIII - at least 2 on PS3, Xbox One X. its the lowest budget feeling game I ever played in the series, but I am a 13 fan, and the ending battle is epic and crazy in a very classic FF way...classic to me being 7-9.
Final Fantasy XII? I will play it when it comes out on game pass...probably.