I only have a top 3:
1. Final Fantasy XV - The wait is finally coming to an end this year!!!!
2. Final Fantasy XIII - Gorgeous graphics, really strategic gameplay, and a story that I enjoyed for the most part
3. Final Fantasy VIII - My first FF title and one that took many years for me to master. Once I understood the junction system, the game became a cake walk. This is one of the few games where paying attention to the tutorials really helped for me.
4. Final Fantasy XIII: LR - Great combat system, but very lackluster story on the overall imo.
5. Final Fantsy X-2 - One of my favorite battle systems out of the system. The story confused the living hell out of me though.