Yeah in terms of service I've found in general
Mainland Chinese providers are crap. They are somehow sexually repressed or something. They often have zero idea of how to do proper service and 70% have really bad attitudes.
Taiwanese providers are a little better but still don't come close to Kgirls. Back at Diana there was a woman named Robin who tried to teach the others that to get repeat customers you sell the love not sex. Sex is mechanical love has feelings, fake it and the customers will keep coming back. She left a few years back and the org girls became mercenary now the place is kinda crappy.
JGirls, I've never had a Jgirl outside of Japan. All the Jgirls here are fake. You miko, Aya, Aiko S. All fake. Jgirls are great except lots of them don't service foreigners.
HK girls rare to see a real HK girl work in the US. The ones I've seen in HK were mostly mechanical better than mainland worst than Taiwanese. Except for one nuru chick on HK Island.
For the price point and service, I haven't been able to find better than Kgirls. The ratio of mercenary vs better service and attitude is higher than Corgs. Korgs get the idea of repeat business. Kgirls aim for you to return. Chinese orgs they think the customer coming in is 1st time=last time to rob them for all they have. That's why corgs fail. That's why they rotate girls every 10 days.
Currently there are 2 Korgs that have seemed to adopt the 10 day house and rotate girls, change names charge higher prices. I am hoping both fail and go away.