best of the best?~

well, i think i'll go for both. They have 2 different genres, Nana is a rocker/punk and Reira is pop/ballad, it's ok if both of them have the same genres in music. I like their songs so much

I'm assuming you're all basing your judgments on the movie incarnation of NANA. Well, even though Nana (Nakashima) has a good voice, Reira (Ito) not only has a voice but stage presence as well. Nana just kind of lashes out on stage, but Reira moves very delicately and in sync with the beat, or whether she's hitting a high or low note, etc.

Nana

I like more the voice of Nana becouse she sing one style of music that I like more. The Reira voice is good to but I just don't like more than nana voice becouse is not my favorite style of music. but all the two are good

I like Nana! ^^ For me she's a great singer

NANA!! I like her voice and her style better than Reira. ^_^