Using the mirror driver (legacy)
The mirror driver provides many benefits. The main benefit is that it provides a Microsoft-supported way of capturing screen output without requiring modifications to the existing video driver. This allows the remote control mirror driver to behave in a standard way that can cause fewer problems on devices.
The other benefit is that the mirror driver doesn't use as much processing power from the target device. If you're remote controlling devices that have a 1.5 GHz or slower processor, the mirror driver can provide noticeable performance improvements over faster network connections. On slower network connections, remote control performance is limited more by bandwidth than processor utilization.
The standard remote control agent is always installed on devices. When the mirror driver is installed with it, the standard agent and the mirror driver coexist. You can't uninstall the standard remote control driver and use only the mirror driver.