Ask a Magician Thread.

poison staff for bossing and training with Paralyze

fire staff for training with FD+Ifrit+Big Bang+Meteor

I'm still unsure which of the two combinations will be more effective for training, but I'd think the more varied one will present better results (specially with FD giving fire weakness to mobs which then can probably be 1HKO'd by BB or Meteo)

Big Bang alone should do more DPS than Paralyze alone; if you consider DoT, Paralyze's base DPS is still lower than Big Bang and since DoT from Paralyze can't stack with itself, you should use Paralyze to invoke the paralysis, and DoT, and follow up with Big Bangs for more DPS. I think Fire Demon -> Paralyze -> Big Bang would be most effective. Fire Demon has the longest timer, and thus if you use it after Paralyze, you waste some of the paralysis timer that should be spent charging Big Bang up. I honestly see no reason to use a Poison Staff unless it increases DoT, and even then, most monsters will die before the DoT is finished.