Choose! Which do you like more? Of course, it'd be nicer if you listened to all of them first.

And vote!
21/2: Mika Nakashima - 見えない星
A proper Mika Nakashima ballad that's slightly jazzy. Excellent work, her first since Sakurairo Maukoro way back then.
21/2: Ai Otsuka - CHU-LIP
Poppy and lightweight fare from Ms.Otsuka who never sold less than 100,000 copies per single, ever since Sakuranbo.
28/2: Utada Hikaru - Flavor of Life
I have no idea how to describe this. Excellent melodies. Vocals... acquired taste?