We’ve all seen those plug sockets with the built in USB ports for charging phones etc yes?

My question is : There are normally a choice of two, the more powerful one (as far as amperage of the USB I believe) and this one is twice the price of the lesser powered one, but I have no idea which one I need!

I’ve been told that the more powerful is the one as it will charge whatever I attach to it quicker.
But does that damage the battery?

Help please.

PS, the header should say socket, and not plug.