I don't really see why they're so popular, at all. Most white girls in their 20s aren't cute at all and pretty boring to look at. Of course there are a few exceptions, e.g. there are some cam girls or soft core models, usually 18 yos, who are really gorgeous but those are the absolute exception.

Just something about changes in their facial characteristics that makes them unattractive. I think they can be quite cute in their early to late teens (best case scenario) though, depends on the person a bit but 20s is usually too late.

Asian, especially East-Asian chicks on the other hand are much cuter. They are pretty in their teens and are mostly still gorgeous in their 20s and even when they're older they usually are. They just tend to age much better, have prettier, younger looking faces even later in life compared to white chicks for instance. Combine this with them also being shorter on average, so more petite, skinnier, and less curvy, e.g. smaller average cup size, I can't see why they wouldn't be superior to white women.

Then also consider that adult white women are usually obese, e.g. 40% rate in the US while the obesity rate for South Korean or Japanese women is low single digits. I'd know who Id prefer for a long term relationship ....