Asus Android Driver will not only establish a connection but also provide some advanced features to the users. If you install this driver on your Windows PC, you can access those features on your device. For example,firmware update and downgrade, flashing stock ROM i.e. reinstall the operating system of the Asus Android phone etc. are possible by Asus USB driver.
Moreover, you have to install only the official Asus ADB drivers for connecting the phone only to access Official Asus PC Suite.