Hello, the Apple 15W magnetic charger and 20W line charger are both fast chargers launched by Apple, and they are able to provide fast charging functions for Apple devices. Among them, the magnetic charger is more portable and can be charged on the device through the magnetic absorption, while the wire charger needs to be connected to the device by cable to charge. Since the two power is different, you can choose the right charger according to your needs. If you need a faster charging speed, it is recommended to choose a 20W line charger.
Apple's 15w wireless charging is more convenient, while the 20w wired charging is faster.