Battery charging by usb port on PC and adapter which is better

Please help me
Battery charging by usb port on PC and adapter (enclosed with IPHONE box )which is better?
Regards

Adapter is probably quicker as you have slightly better power than from a USB socket

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    For better future reference, you should be aware that the voltage means nothing when it comes to charging power. All that that is telling you is that the Power Adapter will work across that voltage range, i.e., you don't need a transformer to plug it into the outlet (although you may need different plugs, which is a separate topic).
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    A high-power USB port on a PC will put out 0.5A @ 5VDC, or 2.5 W. Be aware that not all of the ports on any given PC are likely to be putting out even that much power, at may well be putting out less than half as much. That's why you'll often see the "Not Charging" when plugged into a USB port, especially on Windoze laptops, and why it will charge very slowly even when it works.
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