This is quest tree for Umbral choir:

https://endless-space-2.fandom.com/wiki/The_Umbral_Choir#.C2.A0Potential_Unique_Faction_Quest_Rewards

I think it's heavily biased towards scientist/scientist branch. You never get enough sleepers for Peacemaker to make a difference; Bandwidth isn't a problem for choir; extra evasion is nice, but nowhere as nice as ability to hack more systems and just make more ships a few turns later.

Also, the final reward is hidden behind laws, so new players have no way to know which branch leads them to best reward.

I propose doing the same thing as in Horatio quest: give extra hacking op for all branches, and replace second scientific reward with something else.