That's tough.....Block B

GD(Big Bang) or Jimin(BTS) (hair color choices)

GD

Taeyang(Big Bang) or Woozi(SVT)

woozi

up&down or ah yeah (exid songs)

Up&Down

Mingyu (SVT) or Chanyeol (EXO) (Trees)

mingyu

run devil run or mr. mr. (snsd songs)

Run Devil Run

Loona or Gfriend

gfriend

ring ding dong or lucifer

Joshua

N (VIXX) or V (BTS)

Everyday or Millions (Winner)

millions 

daesung (bigbang)  or seungyoon (winner) [vocal]?

seungyoon

jealousy or shoot out (monsta x)

Shoot out 

Ten or WinWin (WavyV)

winwin

taeil or doyoung (nct vocals)

doyoung

somi (i.o.i) or wonyoung (iz*one) (center)