People saying Beyoncé doesn’t belong makes me laugh because she’s arguably the best out of the 4, especially if we go by the criteria https://twitter.com/daniel_tweets1/status/1292085180140789760
I’d just like to add in no way am I saying Beyoncé is better. I do think she is, but honestly I don’t have the qualifications or experience as a vocal technician to say that as fact. I’m just saying she holds her own here.
for everyone who seems to be in doubt, watch this. Beyoncé definitely holds her own.
But my personal ranking would be (in their primes)

Technique - Beyoncé >= Mariah > Whitney >> Celine
Range - Mariah >> Beyoncé > Celine > Whitney
Breath Control - Beyoncé > Mariah >= Whitney > Celine
Agility (for fun) - Mariah >= Beyoncé > Whitney > Celine
Low notes - Beyoncé > Mariah > Whitney >> Celine
Mid Belts - Whitney > Beyoncé >= Mariah > Celine
Upper Belts - Mariah > Beyoncé >= Whitney > Celine
Head voice - Beyoncé = Whitney > Celine > Mariah

Overall - Beyoncé > Mariah > Whitney > Celine
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