Hello, my main computer is a rMBP 15". I am looking for a lightweight portable device for pdf viewing/annontation and PowerPoint viewing. How the iPad Air and Galaxy Note 10 2014 compared hardware-wise and software-wise in doing these jobs? I think Office is not available for these two devices yet. As I am doing pdf viewing/annontation and powerpoint viewing in some areas without wifi access, remote login is not an option.