I may fill in details why later. For now, I'm just going to try and list them. I will also just stick to entries I've beaten. I based my opinion with the bottom entries on how likely I would be to come back to the game. From best to worst.

VI
Tactics
IV
IX
XII
V
Tactics Advance
III
VIII
XV
II
VII
I
Dissidia
FFTA2
Type 0
FFX
VII Remake
X-2
Crisis Core
Revenant Wings
FFXIII