Ah, I see my lolicon gang now.
Good to know, man.
Addition to what Eab said:
Cherry has ATK down ability (-15% to all enemies) which is very good for nerfing pests.
Hanamomo does hell lotta damage (3.6x) to a single enemy.
Dendrobium has 2x skill activation for the 1st turn only. If you power her skill up, it usually mops enemies up within the 1st turn.
I would suggest Dendrobium but since you're thinking of getting Cherry, you can go ahead coz all 6★ girls are damn strong anyways. Btw, if you did pick Cherry, she goes very well with Sakura (later on when they get their Bloomed Form) in terms of killing high-level Raid Bosses since their ability gives additional damage during Raid Boss combat. With both their abilities combined, the party's ATK can go up to a fucking 108% increase!!