The best team to aim for from the beginning. They have great survivability and flexibility from Hera's leadership ability, which allows them to share their uniques with each other.
Must have Zetas:
Kanan's Total Defense for cleansing debuffs and Turn Meter gain
Sabine's Demolish for team buffing and mass stagger/expose
Ezra's Flourish for damage + TM Gain*
Zeb's Staggering Sweep for huge damage
Hera's Play to Strengths for Cleanse and CD reduction
*Ezra is also useful in a Jedi team, so you could also zeta him first