Gamora vs Black Sky...

Gamora from the Guardians of the Galaxy vs Black Sky in a fight to the Death or KO with no BFR allowed...

Black Sky is Dual Wielding Sai's...

Gamora is Dual Wielding Swords...

Who wins?

On paper, Gamora should win. Both are enhanced super-assassins, but Gamora operates on a galactic level whereas Elektra doesn't. That being said, I am not convinced. Fact is that, at this point, Elektra has far more feats against skilled opponents than Gamora does. She's tussled with Nebula a few times, but there is a lot of personal baggage going on there as well.

Nebula is more durable per surviving ships exploding near her, but she has **** all suggesting she can survive a fight against someone who can solo the Defenders.

Elektra Nachos guts her

Black Sky wins

Gamora wins. She is a really skilled fighter who is more durable, stronger and appears to be faster, or at least more agile.

Black Sky wins, easily.