The output current of the 10-watt charger is 0.8 amp, and the output of the 15-watt charger is 1.2 amp, which means that the power difference between the two chargers is one-third, and the output current is also one-third different when working, so that the work production efficiency of the two chargers will also be one-third different, so the 15-watt charger in all aspects is one-third better than the 10-watt charger.
The difference between 10w and 15w is that 15w has higher power, faster charging speed, and also full of a mobile phone, 10w takes one and a half hours, while 15w only takes one hour.