1. Hmmm. That's a little hard. i really never could decide which style i liked best on her. She seems to succeed in every style attempted so far...
2. Eh, also i cannot decide. Her "squeaky-ish" voice is very cute, and her "mature" voice is sometimes fun, and matches the lyrics to her songs. I still think she could pull off the "squeaky" voice still, but she knows and chooses what she wants. I accept that.