Pink miko is the best. Another example of her poer, my Gold Counter team (Pink Miko+Mountain Lily+Poppy+Tartarian Aster) + Easter Cactus killded all the Nidhogg bosses on the first day (the others days they don't do their job but it's because bosses are broken with heal and ATK boost).
I guess Saffron+Pink Miko is a solid choice. Anyway, Saffron is just top tier among the Rainbows and Pink Miko is a top tier Gold.
I don't remember who said that but if we had tier rank from S-tier to D/E tier, Saffron will be S-tier, like Kerria. And Pink Miko will be S-tier too (she is even better than some 6* in term of abilities).

And she is not even a waifu (actually she is just abattle waifu due to her power).