Hi, We have a group presentation coming up and after using Keynote, I can't use that other famous software. In short, is it better to go for the Mini Displayport to VGA adapter or the Lightning to VGA adapter? Its nice to just carry my iPad on the day vs the Macbook Pro, but can't justify £40 for the Lightning adapter that I will use once. What is the pro and con of each? It has to be VGA because thats what the projectors use. Thanks!