NuUhura isn't a feminist character. She's just a blackmailing, unprofessional bitch, who is only developed and defined by her 'relationship' with NuSpock. Kira is a strong and tough female character, who has lived a harsh life and developed a necessary armour to protect herself, but underneath she has great pain and kindness, as well as the capacity of forgiveness and understanding for some of those that occupied her world and oppressed her people. She is probably the best developed individual Trek has had, definitely the one who has shown progressive and consistent growth. She has more character and heart in her left pinky that in NuUhura's entire person.