I kind of want some opinion about who should I go with rairity growth between Protea (Got her) and new girl, Pickerel Weed. (need to try my luck)

Protea after growth has a greatly increase double attack chance. Her skill is powerful sweeper and boss killer in a package. (Slightly inferior to pure boss killer skill though) But aside from 60% follow up, the rest is pretty vanilla with decently high atk boost, skill act boost and add weak to slash. (The last is pretty dumb down due to many powerful rainbows have slash attribute) For me she leaned to sweeper rather than actual boss killer, but 60% chance is pretty high and once the first attack clear all small flies, the second onward will be more powerful.

The new girl, Pickerel Weed is clearly boss killer with her skill set once growth. With total 80% atk boost and 50% damage boost to boss and similar sweeper+nuke in one package like Protea. Her base stat is low however, with only 7300 atk vs Protea 7900. She got higher HP and def though, with slightly lower spd. (-50)

Sum it up to
Protea
PRO: Higher atk and spd
Currently highest chance for double action with 60%
Sweeper than can nuke
CON: Abilities set is pretty vanilla
Lower hp and def, thus risking early dead on broken map
Lower consistency with her most powerful perk relied on chance
Pickerel Weed
PRO: Higher hp and def
Abilities set is obviously aim for boss killer with none rely on luck or chance
Nuker that can sweep
CON: Very low atk for rainbow, slightly lower spd compare to Protea
No survival skill so might not survive long enough to actually contribute in broken map.
Don't have her yet, so it all might be just theory in the end

All opinions welcomed
PS: if Christmas Saffron has this 60% chance double act, I wouldn't have to think much like this.