Depends on your need. Of the ones you have there, Phoenix is the one who benefits the most when you awaken her. And she is highly underrated. The regen is insane when in the right hands. In the current setup, she's one of the best lane runners for AQ when awakened.
That being said, if you don't have Medusa awakened already, it's probably better to save for her.
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That being said, if you don't have Medusa awakened already, it's probably better to save for her.