Girls' Generation had the best group choruses and are the only girl group that actually sounds like all of them are singing together imo

Yes all SM groups sing their choruses together, but of any girl group of the big 3; SNSD is the only group where it actually sounds like you can hear each member.

Red Velvet's choruses just sound like Wendy and Seulgi singing loudly with background vocalists. I can barely hear Joy, Irene and Yeri in the choruses.

And I say this as a ReVeluv