What to select from necro carina selector

Raiden01

I just completed all 6 carinas for necro and was given the choice of selecting either maestro or a titan nexus.
I have not completed necro and not planning to do so as well, so it might be my only chance of getting him at 7* rarity. (I have a 6* maxed out maestro though)
As for the new titan I already have dazzler and gentle unduped, and zola duped. (Really looking for either of the mutants dupe or an okoye)
Help me with the selection.

captain_rogers

If you just want okoye or mutant dupe, you can wait until September so others will leave and new guys would come (who you likely want to pull as well).

If you want someone to use immediately pick maestro