Do you consistently hit 8 hours on all voyages even during faction events? If not, which are your weakest voyages? Surak or Ruafo citation would make the biggest difference immediately for being such strong crew for voyages. Long-term Leonardo would be better than Surak but it'll take a while.
Troi is an outstanding event crew (high SEC period and by far Troi event best sec), but doesn't have that daily voyage help.
Are you hurting more for ENG or SCI? Ru’afo and Surak stand out as the most obvious choices for a big boost, with an extra star on Leonardo as another good choice for base SCI and voyage improvement.
I've got melty face FF/FEd and he gets a lot of use in voyages. Leo, when he is FF/FEd is a powerhouse. The one shot-ers (Minuet/T'Kuvma) would benefit, but not as much as focusing on the regular crew.
Best thing to do is see where your skills need work and focus on those.
The Guardians of Tomorrow Protecting the Galaxy's Future from itself
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Troi is an outstanding event crew (high SEC period and by far Troi event best sec), but doesn't have that daily voyage help.
Best thing to do is see where your skills need work and focus on those.
Protecting the Galaxy's Future from itself
Between Surak, Ru'afo and Leonardo there's probably no wrong choice. Though I'd also be half tempted by Durango.