What is the difference between hydrogen OS and oxygen OS?

The difference between domestic (H2OS), overseas (Oxygen OS) and geek (Oxygen OS) is probably as follows: Oxygen OS: (Besides, it is close to AOSP and has complete experience in material design) has a complete set of Google services (it hurts if it is not FQ in China). You can open the virtual button. You can customize the physical buttons. Quickly customize the notification bar. H2OS: (change UI, interaction and localization. Operational logic change: double-click the home page to drop down the notification bar, remove the notification bar drop-down switch, slide the notification center at the bottom, drop down the notification bar to the middle, slide the notification to the left to open the right to delete, and cut off the dock bar. There are no Google services such as SMS card, SMS WeChat WeChat official account, contact photo in address book, yellow pages in address book, hydrogen window, etc.