Until I got Ultima Weapon, the Ever After Keyblade was my favorite.  On the Battle Report screen it said I used it for a total of almost 10 hours, with the Mirage Staff being my most used Situation Command, with a total of 91x.  Love using the Mirage Staff too, especially with bosses.  Just dash four times to create four clones and spam X to have all five of us fire balls of light at an enemy, melts health.  Of course, Ultimate Form melts health even quicker, since Sora basically becomes Noctis with his Armiger.  I destroyed the Secret Boss Dark Inferno with Ultimate Form.