Tbh, its pretty spread out right now. Girgl groups are outselling, but there is no one girl group that is leading by a huge margin.
Aespa is doing great in sales and good in charting.
I've had korean charts and streams as well as Spotify streams.
Gidle has a huge hit with tomboy.
Itzy has solid touring and streams.
It doesn't seem like one group is the top gg for now. I think 4th gen may be a generation where multiple groups lead.