Help!

I'm not too sure which 6* to get, since I already made the painful decision to not get gorgeous Lycoris. I'm debating between Kerria and Saffron right now, both seem OP, but I can't decide which way to go (considering Mei Plumblossom and Anemone, but not as close as those 2). I like Kerria's skills better, but pierce is probably one of my weaker ones, and I'm getting worried about the whale ships. I'm looking at end-game mostly, which I know is way in the future, but I'm mostly focusing on their bloom stats and abilities. This is what I currently have

Hit:
Flowering Peach, Viola

Magic:
Dogwood, Nerine

Yeah I know, not much. I know Saffron can be bloomed right now, but that doesn't matter to me, since I know Kerria will be bloomed 'eventually'. I like Kerria's absorb HP on her ability and that I can make her a tank for my teams. Does anyone have any input, or are there other 6* I should be looking at?