Please note that any USB-C cable with USB-A plug on one end will not charge your 5V 3A devices at the maximum current. Legacy USB-A chargers go up to 5V 2.4A max. As mentioned, in my testing with my Huawei Nexus 6P, I didn't notice too big of a charging speed difference even with the lower current output.
Anker USB-C to USB 3.0 (3ft) Cable Review
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