First merge project completed!
Congrats. Nice to see some lesser used characters getting loved. As Krazytre said, Cherche's a nuke, Camilla's mixed phase and support. If it's about scoring, Cherche will kill everything she goes near, thus robbing your bonus unit of kills so I'd say Cammy is better for that purpose. Whichever one you choose as a 5* merge, I'd recommend doing the other as a 4* merge since they're both pretty good.