Yes, the iPhone will charge at a quicker rate if you use a USB-C cable and a USB-C charger. You can charge the iPhone to 50% in roughly half an hour using USB-C. The iPhone’s maximum power is roughly 22 watts, thus a 20-watt or 30-watt charger would provide around the same charging speed. Any USB-C charger, however, will be substantially quicker than older USB-A ones.