It’s a tough one, I feel Gamora wins by default of being the only one I like that is used consistently. As someone who became a fan of Marvel cosmic in the Giffen/DnA era, it’s between her and Phyla. I am glad that some version of Phyla is being used again.
Cammi is great, there’s a lot of potential there. She was a part of Avengers Arena/Undercover, the CM Punk/Bunn Drax book and the recent Cosmic Ghost Rider mini.