I have some questions about those 5 star girls we can choose from. Is it really true that Justicia is the strongest/best of all? I dont really understand just by looking at her skills. Only 10% more attack and 1,2 skill activation? Is it really that great?

I still have 2 4 star girls in my squads and want to replace them with gold. One is a 4 star pierce (Canola) unit and one a 4 star magic unit (Cyani).

So my next question is:
Of all the magic girls there which one is the best? I like German iris and Queen of the night but are they really good?
Just to clarify i already have Strawberry, Setaria and Leucocoryne.

The last one:
Of all the 5 star pierce ones, which one is the best?
I already have Chocolate, Toad, Lily and Iris.

Thanks for your answers