As far as I know, ALL wall charger output via a usb-a socket, and the other end of your lead goes in your phone. So it doesn't matter whether you use a usb-c or micro-usb.
As for power! Well it's down to what you can afford, Anker does LOADS if wall charger, all fit for various purposes..
Also, will you want 1 or more outputs?
I'd say, buy the biggest bestest one you can afford.... I don't know the range well enough to just quote you a specific wall charger, plus it's up to you.