In comparing vocals among the four girls, Jasmine has a breath-control problem. She has a fine natural singing voice, but loses notes because she doesn't have the breath control to support long or high notes. It's been obvious in her singing from an early stage in the competition. She also is a bland performer. Very definitely a cut below the other three, Jasmine could benefit by some excellent vocal coaching.
La Toya's voice lacks a mellowness and roundness. That leads to a kind of slightly screechy, cold quality to her upper register.
In contrast, Fantasia has a beautiful, warm, full quality to her voice, plus all the power and control anyone can want. Although young, she's already on her way to becoming a true, original song stylist.
Especially considering that she's so young, Diana's vocal tone and control are magnificent. Right now, I think the only thing that separates her and Fantasia is three extra years of experience. Diana is still a perky, bubbly 16-year-old who hasn't found her own personal style yet. Fantasia, at 19, as I said, is already developing her own unique style. She is more able to bring a depth of emotion to her songs. Both girls truely are superior to anyone else who's been in this year's competition.
Diana, while younger, has more public singing experience. She's been performing since she was 6 years old. I will agree that Fantasia has a more defined style and personality, part of my problem with her is that I don't like the alternating thug/whining brat personality that she has.