I never really used Chihaya so looking back, maybe her. But I didn't ever really try to max Ann's confidant, and always prioritized other texts over hers.
Don't get me wrong, dekaja and matarunda were useful skills, and her wanting to "strengthen her heart" made me give her a little more credit, but something about the borderline "forced shipping" in the beginning and her in battle overall just told me to avoid her.