I prefer softer, but I like both, depending on song and if it has complexity, if it's listenable, if it's not too repetitive, if the vocals are good, if it feels connected and a lot of other factors.
Again with rap, it depends, if it seems/feels forced, forcely put intoor trying to sound cool, I don't like it much. It just has to fit the song.
Noisy music? I don't even know at thus point what people consider as noisy music. A lot of songs are labeled as noisy. Well it again depends on the song.
A lot of songs that people don't label as noisy often, seem noisy to me, so... It's a expression used very subjectively in kpop.
My preferences don't change if it's a bg or gg.