It depends on who else you have on the team. If your team has raid boss killers like Sakura and Cherry then Maple is the better choice for RB fights. If your team has girls with the same ability (Black Baccara, Kerria, Daisy, Helenium and Cattleya) then Maple is the better choice. Otherwise Serissa might be the better way to go.
If you can swing it, I'd echo Drip's suggestion about just putting them both in the same squad.