First the triumvirate:
1. FFVII
2. FFVIII
3. Suikoden II

Even if I'm not 100% certain about order among them, I'm sure those are my three favorite so I'm setting them aside as in a solid unassailable position. The rest are of fairly uncertainty position in my list and could not only move down in ranks on the top 10, but possibly be displaced by my honorable mentions.

4. FFVI
5. FFIX
6. Xenogears
7. Persona 5
8. Persona 4
9. Persona 3
10. FFX

Honorable mentions (no particular order):
FFIV
FFT
Secret of Mana
Chrono Trigger
Chrono Cross
Suikoden V
I'm fighting especially hard to keep from replacing FFX with FFIV telling myself it's just nostalgia, but it is the FF game I've played most, so nostalgia or not I may just crack and switch them around.