Camellia was not worth grinding? Who said that? If I have her she would never leave my squad T.T

Anyway, this game does not need the "best" units in terms of stats & skills. Just level and evolve them and you can clear the game with no issues. (At least based on all the maps we have so far). Ultimately, just play with whomever you fancy and don't be bothered with numbers too much.

Also, don't be afraid to evolve the lower rarity girls as well. They are easier to reach the level required, and the bloom dragons are easier to acquire as well. Their evolved forms can hold their own just fine.