[Andrenekoi]

^When both started singing, Utada had a far superior vocal technique than Ayu... But both were pretty bad... Over the years, Ayu worked hard and became a aceptable vocalist (still, she was never amazing), but Utada never really cared... If I'm not wrong, the only time on her life she had vocal training was in 2004 when she was preparing for the Budokan Concerts...

Both girls are gifted with good voices, and both of them can easily do some rather hard stuff with their vocals, but both lack training, and Utada lacks more training than Ayu^^

Before some creepy Utada stan (some of the worst in jpop ~~) comes her bashing me, I myself prefer Utada over Ayu...