A USB wall charger is essentially the same as a wall charger. USB chargers plug into a wall outlet, so there's no difference in charging speed between the two. The charging speed primarily depends on the charger's wattage and the charging capabilities of your device. For faster charging, use a higher-wattage charger if your device supports it. Additionally, some devices may support faster charging through specific charging standards (e.g., Quick Charge, Power Delivery), so using a compatible charger with those standards can also speed up the charging process.