Hi...sorry for the late reply.I was going to ask you about this- if you were using OneDrive, and how you felt that it complemented a good work flow between both devices?
Yes, OneDrive is an essential part of the digital experience that I am immersed in - most of the time. It has - over time - become the central repository for all my files. Of course, I have up-to-date copies on local external drives, but they are back up. With very few service hiccups, OneDrive has worked well to keep my desktop machine, the two Surface devices (SP3 and S3), my two Win phones, and the iPad Air (which I have not picked up since I got the S3) all in sync. I back up documents and pics to OneDrive. One thing that I really like(d) in Win 8.1 was to have the quick access to all files on OneDrive with the off-line capability. I moved the OneDrive folder to the MicroSD card (on the SP3) and it has served me well till date. I have not yet done this on the S3, but that is because I am being very lazy at the moment.
Some of the apps that I use regularly like Drawboard PDF, Book Bazaar, Book Viser, among others, sync though folders stashed on OneDrive, which also means my annotations and markings are also available across devices (Drawboard does not have a mobile app though - at least I don't know of it).
So, to answer your question OneDrive is central to how I move from one device to another almost seamlessly. Sure things could be better - even more seamless and hopefully Win 10 will bring more of that to the party.
One thing though - this reliance on OneDrive also means a total reliance on some form of connectivity. As long as I am at my current location where I am always enmeshed in either public or private networks, this is not always the case when I travel to some locations overseas. Connectivity can become slow, patchy and sometimes even non-existent. That is where I feel the most pinch in terms of being so heavily reliant on OneDrive.