As much I love Ayu I couldn't agree with some of you about her voice now. Even if sometimes is more powerful and deep than before.
I've watched some Namie's lives and she's great at dancing and singing, but her vocals aren't so great or particular compared to Ayu or Kuu imo (even if I like
a lot Namie's music).
So I've voted for
Kuu. Her voice's great during lives and sounds almost exactly as the studio voice

.