First Order vs Nightsisters: whose Best and Easiest to farm for GA Defence

Talking from my tier 3 GAC 3.6M account, I have never been in the necessity of gearing FO team after BB8 event.

I do not have a useful FO team, I do have a NS team and I have used it even in arena to beat zBastila teams in the past.

I do use NS to beat Geos or zBastila in TW and GA. And think they are more useful attackers than defenders.

I had extensively used zAsajj to beat the tank in the past

I use them in p4 HST

They have given me lots of zeta materials due to recurring event.

I do not miss having a useful FO team at all