>>4925282>SoraClean, consistent. Doesn't 'search' for notes very often, mostly noticeable when moving between registers. Relies heavily on her head voice. Has to work harder as a natural alto singing in idol register. Good breath control. She does her lesson reps. This is the voice you use in a recital or concert.
>SuiseiPure soul. Good sense for vocal flourishes and when to use them. Less range, uses pure power to belt her high notes. Uses vocal fry for low notes, not a problem and kind of sexy. Her vibrato, while nice, is a sign of early damage. Will hurt her voice in the long run. This is the voice you use in karaoke and singing competitions.
Suisei is more talented, Sora works harder. Neither one is particularly good.