Note: I think there used to be this discussion in the old fandom before it was wiped out like how the Skullpounder got wiped out. That is, tragically (RIP. We never even knew you).
Note II: spoilers up to 0.58.3
So basically in Gawnfall we have the choice of allying with Keranni or Esmera. I actually have two complete safe files (until update 0.58.3); one with Esmera and one with Keranni.
Esmera wants unity in the church and more unpeople. Keranni wants ... not clear.
Overview (in the actual Gawnfall)
Well, we can see that Esmera provides a lot of help during Gawnfall. You can shoot down the Unity vote in day 2 more easily. Also–funnily enough–the Unpeople vote is more easily beaten so long as the Unpeople vote in Ardford failed. Another point is the Purity vote, where not siding with Esmera slaps you with +2 Kaskia score.
That all is why I picked Esmera in my playthrough. However, one other factor I didn't expect rises.
Okay, so why is Eustrin Final important? Well, one harem member, support for Elleani, cheaper item in Incubus Prison, hilarious sex scenes, and the feeling of satisfaction for being able to finally slap Aram on the face.
In Eustrin final you need 3 negotiation pushes. One is free. Another is offered by Iris (-10 Arc. Acc.), Carina (-3 Ivala Acc.) and Orilise (or Megail? I forgot) (reduces Aram score and switches Aram Punitive on)
But if you sided with Keranni, you get one free push from her AND +3 Ivalan Acc AND +1 Arc Acc. Esmera, on the other hand, only offers +5 Arc Acc. OR +5 Aram OR +2 Ivalan Acc. (You still get +1 Ivalan Acc from Keranni even if you side with Esmera. Such a kindred soul).
Hence the question: Esmera or Keranni? I think Esmera's better if you don't have the resources for Gawnfall (high Sarai influence, the investments that matter like Givini Tunnels and Ivalan Bank, etc). For long term gains Keranni is better.
What do y'all think?