In terms of technicality this is how I would rank 4th gen vocalists
AA+: Yechan. She is a 1993 born idol and has recieved training for much longer than others, but she is 4th.
A/AA: Ningning/Monday (Monday has shown much stronger belting power than Ningning but she is REALLY messy above a certain level, and her masked singer showed it) (Ningning I would say is lower for now but she's cleaner and I literally have 0 content after Maria so I can't tell now)
A: Yunjin, Goeun, Yuri (All very similar levels and I believe Yunjin will be placed here when debut)
A lot of vocalists are A, but there are the strongest.
Craxy's Swan is A, but slightly lower. Some quite impressive duos that are more nugu are here. Aespa's Winter and possibly Karina are on the A spectrum as well, but on different levels. Weekly's lead vocalist is also a lower A. Purple Kiss's Swan may be W-A or A, she seems messy at times and stylistic but she is a good belter and not bad mix. The lowest A I would put here is Lightsum's Nayoung, one of the strongest Cube female vocalists in quite a while. Ella from Pi is also a A? Haeyoon from Cherry Bullet is also an A. Bora is a a low A.
W-A: I'd put Karina here for now, but she's a very strong W-A, and if I hear her again, I'd put her on A if she shows that development. Giselle from Aespa is here. All of Stayc have very little support so they are around here. Everglow's Mia. A LOT of boy group vocalists...yes even Jongho is average but the pool is really bad. Keenho seems promising, the stan twitter guy. All of TXT and Enhypen are underdeveloped.
So my final rank:
(Yechan I have omitted for age)
1/2 Monday-Weekly/Ningning-Aespa
3. Yunjin*** or Goeun-Purple Kiss
4. Yuri- Iz*One
This is where it gets confusing.
5-10
5. Swan-Craxy
6. Denise-Secret Number( overhyped but still a spot on here, she struggles with belts)
7. BVNDIT- Jungwoo
8. Lunarsolar are a nice group and possibly Jian would be here.
9/10 Haeyoon-Chebul/Ella - Pixy
5-10 are all quite close to each other:
Special Mentions:
Weekly's Soeun (good potential)
Aespa's Winter (Seulgi/or slightly stronger because of her opened Bb4s) Best Lead Vocal of 4th
Purple Kiss's Swan she is very stylistic but her mixing is good enough that she is one of the tops.
Aespa's Karina (surprisingly good development with strong A4s)
I don't consider Fromis 4th gen but Jiwon is very strong.
I think CRAXY's Swan and Aespa's Ningning have a chance to go up
The vocalist with the MOST potential is Weekly's Monday, she needs to fix that messy belting and she'll do wonders.
The best vocal line would be:
Aespa>Weekly>> Purple Kiss> BVNDIT/Lunasolar> Chebul