I found a very insightful video ranking the new gen GG members in terms of vocal technique. I think it's pretty accurate and shows plenty examples of their strenghts and weaknesses:
The list is in order btw.
Competent vocalists:
Capable vocalists:
Solar - Mamamoo
Hwasa - Mamamoo
Standard to capable vocalists:
Standard vocalists:
Yeonjung - WJSN/IOI
Jihyo - Twice
Seulgi - Red Velvet
Jeongyeon - Twice
Substandard to standard vocalists:
Chaewon - April
Nayeon - Twice
Substandard vocalists:
Seunghee - CLC
Miyeon - (G)-idle
Joy - Red Velvet
Fringe/undeveloped vocalists:
Jisoo - Blackpink
Eunha - Gfriend
Non vocalists/Undeveloped vocalists (mostly rappers):
Yeri, Irene, Lisa, Yeji, Yeeun, Selkie
It's kind of impressive how Wendy is on her own level and also shocking how the level of 3rd gen vocalists is way weaker than 2nd gen (Taeyeon, Luna, Eunji, Hyorin, etc etc)