Just in my personal experience Stray Kids seems #2 after BTS in fandom popularity right now! And they look cute and fun and...I have been holding out on actually listening to their music but we'll see XD

I have at least heard of most of the others, except Golden Child and Pentagon (there are so many!) NCT just makes me boggle, though...how do you keep track? It took me over a month just to learn 7! XD