Originally Posted by
Namakurimu
Fire team would be better seeing as there's only 2k Difference in power,
My suggestion for you would be to focus on Raid Battles to acquire SR weapons of the respective element you want to raise.
Raising the skill level of each weapon would do wonders to both your power and the hp of your characters. Since next is Wind event, expect the usual properties of a wind type enemy [Fast Burst, Moderate Damage, some are immune to status ailments.]
Going with fire team with Aggression in mind will help your battle.