The bigger the number the faster the speed. Buy a 2022 MacBook Air M2 and its base spec ships with a 30W charger. That'll take around 2.5-hours to fully recharge the system, so it's not very speedy.
Some support 100W (5A x 20V) charging, and some new Thunderbolt cables can charge at up to 240W. 60W is more than you need for a phone and is perfect for the MacBook Air and 13-inch MacBook Pro.
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