The usb interface charging on the socket is the same as the charger, the difference is that the protection function is not perfect with the mobile phone, there is no difference in use, but the mobile phone charger has the fast charging function, but the socket USB port does not have the function.
Relatively speaking, the built-in USB interface on the socket, the highest voltage can reach 9V, and can support 18W fast charge, at present, the charging voltage of most smartphones is 5V, but the charging current will have different differences.
If it is a standard usb interface charger (some mobile phones use non-standard interfaces) there is no difference. No matter the phone charger or the USB port of the computer, it only provides a 5V power supply (strictly speaking, the phone charger is not a charger in the traditional sense, just a 5V DC power supply).