Yep, I do exactly the same thing with my Surface Pro (no need to pair with a phone though), so in the end it's whatever OS floats your boat.
Of course you need to take into account your back up plan in case you have a disaster with your device and end up using whatever type of PC is connected to your clients projector!
Given that most corporate IT departments disable USB ports and DVD drives I use a Microsoft wireless HDMI dongle that my S6 phone can stream Powerpoint to, mind you I need to put my reading glasses on to read the notes!