This really isn't a thread about phone charging. This is just simple physics.
Amperage delivered by your charger is a pool. A 1A charger has 1 amp of available power to deliver. You can hook up 5 200mA devices to it, 2 500mA devices, or 1 1A device. If you hook up a 1A device to a power supply that delivers OVER 9000(A)!!! you won't charge any faster and you won't hurt your device. All you need to do is match voltage and make sure your charger provides at least as much amperage as the device will draw.
A 2A charger will NOT charge a device drawing 1A of power any faster than a 1A charger. However, there are quality differences in products and your 1A charger might not be providing the full 1A of power, so the 2A charger would in fact charge your device faster. Also remember that the quality/age of the device, cable, and charger all come into play, as well as whether or not your device is in use during charging.