When I discover groups, I usually look at the guys first, then the songs. I mean, who doesn't. Then there my biases... till I look into them more. 

Examples...

MBLAQ

I liked Lee Joon....

...Know I really like Thunder 

BEAST

I liked Gikwang...

.... Now I really like Yoseob

Big Bang

I liked Seungri...

... Know I really like T.O.P 

Teen Top

I liked L.Joe...

...Know I like Changjo

2ne1

I liked Park Bom...

...Know I like Minzy

B.A.P.

I liked Jongup...

.

...Know I like Daehyun and Zelo ( I can't pick one 0-0) 

Infinite

I liked Sungyeol... 

... Know I like Dongwoo

SHINee

I liked Jonghyun...

....Know I like Key

Suju

I liked Eunhyuk...

... Know I like Yesung

f (x) 

I liked Sulli...

... Know i like Amber

Block B

I liked Kim Yukwon

... Know I love Kim Yukwon 

Truth of the story is... Biases change for me. Haha, btw. I don't hate anyone I just listed. I just like the other person a bit 10 % more... Maybe later I'll post my bias in each group list ranking... thingy