Well, GFE always seems to have different meanings, but at least at the Chinese places in Chicago, you probably get a bbj and some light kissing. The independent girls will probably give you more of a girl friend experience.

As for Dongguan, I can't answer from experience, but there is a place in Chicago that offers it, and I've seen a guy's review of the Dongguan style he received and his explanation.  I think "officially" Donngguan style contains 36 different steps or moves and it's supposed to last minimum 2 hours. I doubt you'll get that in the US.  I am told, at the place in Chicago, the girls give a "cat bath" and the session involves several different kinds of rimming. I'm not into rimming, and I have a lot of body hair, so I will likely avoid any Dongguan style.

At the center of which is Queefeng Park and an Opium Museum. My guess is that Dongguan style is when they smoke some opium before the session to improve their mood and then queef a lot during the session.

I found this
https://www.globaltimes.cn/content/982835.shtml

Also found this. I like the sound of a handstand bj I just hope that means her doing the handstand!
“ GuangDong as a province doesn't really have any special links to the sex trade, but it's one of the biggest provinces in China and it's famous for the local tongue: Cantonese. DongGuan on the other hand, is just a small city without any significant industries, but it is known across asia as the capital city for adult services. They went so far as developing a unique way of proceeding with the session, hence the name: DongGuan style service or DG style service (莞式服务). It usually contains 36 different steps or moves and usually last minimum 2 hours( some places has more than 36 moves), cat bath is one of the famous ones amongst the 36 moves. It also includes other famous moves like the hot tea service, handstand bj, several different kinds of rimming and so on.  

Normally the girls need to get trained for 1 to 3 months by a famous and recognized massage parlor before they can call themselves DG Style Masseuse, and only then they are allowed to look for work else where as a DG Style Masseuse”

36 methods?

There are 36 methods to eat ass?  Omg.  The shaolin of ass eating.   Id like to visit that temple.  

I saw Dongguan listed in the menu offerings in each girl’s profile with a tool tip description at:

www.AsianFever.ch

Sounds basically like a GFE+ session where the first pop is BBBJ only with optional hot or cold water in mouth during head.