Super Junior by far:))

Duets: Troublemaker (Hyuna & Hyunseung) vs Some (Soyou & Junggigo)

Troublemaker

The Chance of Love or Love Line (TVXQ songs)

the chance of love

 Oh Yoon-ah or Go Ara

Go Ara

Jikook or vkook 

vkook

PArk Hyung Shik or Seo Kang Joon 

Park Hyung Sik 

SNSD or Wonder Girls 

Wonder Girls

Exid or WJSN

EXID

CROSSGENE or MYNAME

Cross Gene

NCT or Stray Kids

Stray Kids 

GOT7 or Vixx

im an aghase but i love vixx too much so i cant choose

gidle or izone

actually i've never heard anything from izone since they debuted, so gidle

seventeen's vocal, rap or dance unit?

Wow, this is incredibly difficult but if I had to choose I'd have to go with all of them vocal unit.

Day6 or N. Flying

Day6

SHINee or Super Junior

Shinee

Infinite or Beast/Highlight