Which approach is the best? All the above.
While Miracast and Airplay are well suited for sharing information from your mobile phone or tablet, it may not work well in a collaborative environment such as a law firm or marketing agency where many types of devices may need to share the screen. Today, HDMI screen mirroring systems such as the BenQ InstaShow S can support both notebooks and AV devices with a transmitter buttons, as well as any mobile devices using either Miracast or Airplay. With the InstaShow S- you can even have four different sources on the screen at the same time – enabling a MacBook, Chromebook, an iPhone and an Android tablet to share their content – all with 128-bit encryption for a secure collaboration session.