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.

Both are good Defensive units. If you want an offensive unit
What about Lagurus? She's getting 100% double strike and CRITS whenever she blooms.