It really depends on the situation. Pummel is armor-piercing, so it's good against a single target with high HP and defense. Aura Bolt is holy-elemental, so it's good against undead. Seismic Throw will do four times its normal damage when the target is the last enemy on the board, but it's useless against flying critters. Finally, Phoenix Dance is good against a lot of small enemies with low magic defense (or a weakness to fire).