Ninja is considerably more flashy now than it has been previously. A substantial amount of time is spent casting Ninjutsu and using Ninki abilities now. You've got lightning, swirling flames, water eruptions, ice shurikens, rumbling earth, Bahvacakra, a fire spewing toad, shadow clones, etc. The animations are just more focused and quickly executed than most, so they aren't blinding.

Overall I would say Black Mage is king for flashiness, but that's due to its role. It has to over-the-top explosions to match its heavy hitting playstyle.

I don't personally think that Red Mage is all that impressive as far as this is concerned. Many of the spells are quick, basic animations.