Favorites:

ourselves
alterna
Because of You
RAINBOW
my name's WOMEN (fiercest Ayu ever)
fairyland
Real Me
Do It Again
Ladies Night
is this LOVE
Virgin Road
SURREAL

Least:

ANother Song
BRILLANTE
blossom
Poker Face
Bold & Delicious
progress
NaNaNa
Crossroad
Lady Dynamite
beloved
Carols
You were...

Favorites:

BALLAD
BLUE BIRD
Curtain call
Days
Don't look back
fairyland
forgiveness
HEAVEN
how beautiful you are
INSPIRE
is this LOVE
JEWEL
kanariya
M
Moments
momentum
MOON
ourselves
part of Me
Pride
RAINBOW
rainy day
STEP you
talkin' 2 myself
Together When...
Virgin Road
Why...

Least favorite:

1 LOVE
ANGEL'S SONG
appears
Because of You
Born To Be...
Boys & Girls
decision
Depend on you
Humming 74
my name's WOMEN
poker face
Shake It
Sparkle
Startin'

Favourite
do it again
Sparkle
Pride
JEWEL
part of Me
glitter/fated
is this LOVE?
BLUE BIRD
Virgin Road

Least favourite:
BALLAD
rainy day
connected
poker face
For my dear
Daybreak
CAROLS

funny how BALLAD, connected and rainy day are among my favourite songs ever

favorite
1.M
2.Because of You
3.ourselves
4.alterna
5.Microphone

least
1.progress
2.blossom
3.Lady Dynamite
4.shake it
5.NaNaNa

ugh. I have to go through and re-watch everything because there is quite a bit I don't remember. I was always more interested in live performances than her videos.

But, off the top of my head:

Favorite: (with the exception of SURREAL, no order)
SURREAL
M
is this LOVE?
Rainbow
Mirrorcle World


Flat out don't like
BRILLIANTE
Crossroad
shake it
NaNaNa

Favourite - Ladies Night

Least Favourite - NaNaNa

WOW how could you not like BRILLANTE? Freaking amazing haha