Well FF:Tactics advance has summons, but you need points.
FF:Tactics just uses MP
There is a new card system and laws.<(fftactics advance)
Not to mention Judges which give out penalties.<(fftactics advance)
FF:Tactics (PS1) has several classes
i'm certain FF:Tactics advance has more though.
FFtactics(PS1) is a classic.
FFtactics:Advance is very good, though lacks the epic feeling of the first.
They swear quite a bit as well.
