Originally Posted by
Tomitain
Personally, between New Year's Ivy, Cherry and Christmas Rose I'd go with Cherry or Ivy. Cherry is the only one of the three who currently has a bloom form on the Nutaku side of things, and her abilities make her a solid addition to any raid boss squad, so if you're looking for battle prowess Cherry has the advantage.
New Year's Ivy is a solid choice though. Basically all of her traits, especially her idolization of Sakura, get cranked up to 11. She gets a solid set of abilities along with an even more absurd skill than Gungnir Weiss, so she definitely holds her own in battle too.