I spent years trying different phone companies, I loved my mate 20 pro and thought it was perfect. Great build quality and screen that rivalled samsung, faster charging and better battery life than samsung and apple, and even a better camera performance compared to samsung. Utterly gutted their new phones have google restrictions, its actually making me switch to apple.
Battery life from Chinese brands is typically at the expense of your apps. See dontkillmyapp.
If you rely on some apps running in the background (alarms, etc) the very aggressive app killing to fake save battery can be a huge annoyance.