Most definitely ULTRA BLUE. Along with DEEP RIVER and HEART STATION very close behind. Distance is after that, followed by First Love.

ULTRA BLUE was a mint of fresh air for me. It was a huge step for Hikki, and quite a risky one in my opinion.

DEEP RIVER definitely. :D

DEEP RIVER was my favorite. I'm not a great big Utada fan, but I would even hold this album in the same regards as I hold any of my favorite Ayu albums. :innocent

HEART STATION had good singles, but the album tracks bored me. They were repetitive and just really "blah" to me. ESPECIALLY nijiiro basu. :no

I only like four songs from ULTRA BLUE and even less from her other albums, so... definitely DEEP RIVER. :yes I don't think any of her other albums even compare to it.

heart station

ULTRA BLUE, the songs I like from her are on there ^-^ I don't like many songs by her so..

DEEP RIVER

One of my favorite studio albums of all time by any world artist. There is not one song on the album that I dislike. It also has sentimental value for me as well.

Distance. The first ever J-Pop I could listen in full non-stop when I got it :D
Second would probably be First Love, then everything else is third :)

Distance will always be my #1 favorite. <3

HEART STATION

ULTRA BLUE

Distance

DEEP RIVER

HEART STATION

Easy choice for me. Mine has to be ULTRA BLUE.
I love love this album. And the covers are gorgeous.

It was a tie, but ULTRA BLUE was the first I bought from her... so yeah, had to go with it. xD

DEEP RIVER. duh

ULTRA BLUE. :)

I love DEEP RIVER to death!

HEART STATION followed veeeery close by Deep River