Honestly you could flip a coin and you win both ways.
If you’ve got Rulk/Massacre at 5* go Domino, her awakened ability adds nothing to her use outside of a smidge of energy damage to failing effects. She is still a beast on her own too.
AA is a savage on his own, especially awakened he adds a lot of utility to his damage.
If you run any synergy pairings in your usual questing teams I would go for AA as he can just slot in on his own without needing a team to get the best out of him like you would Domino.
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If you’ve got Rulk/Massacre at 5* go Domino, her awakened ability adds nothing to her use outside of a smidge of energy damage to failing effects. She is still a beast on her own too.
AA is a savage on his own, especially awakened he adds a lot of utility to his damage.
If you run any synergy pairings in your usual questing teams I would go for AA as he can just slot in on his own without needing a team to get the best out of him like you would Domino.