My list actually starts with FFT and FFVIII, but further down is FFX and then FFIX.

I like the more flexible Sphere Grid system, music, and basic plotline of FFX better.

FFIX has my favorite airship ever, (SPOILER)Invincible, and some memorable characters. Also Chocobo Hot and Cold was fun.

I didn't like Blitzball or Tetra Master; Triple Triad is much better than either.