This is a hard question to answer and thankfully it's only hypothetical :smile:
To me the winning point of using MS based kit is the way it all works together and breaking it apart would render each device less usable.
I have the full suite so Xbox One, 1520, Surface Pro, laptop and desktop, my wife has a 520, Surface 2 and laptop and to answer it, I suppose it depends on how you use your kit.
I tend to use my laptop to do most web surfing so I am typing this on the lappy, if I was doing my accounts or writing a letter it would also be the laptop, so although it is the least glamorous it's the most used (As a direct tool). My Surface tends to be more for light surfing, watching catchup TV in the bedroom, playing games but because it could actually do all the laptop could, the Surface would stay out of the two.
The desktop is almost redundant, it was set up as a media center and file server, my files are now all on the cloud and the Xbox One does the media stuff, so it's almost final role is as a print server
So to the three devices I actually really enjoy owning, my 1520, Surface Pro and my Xbox One, and this becomes a nightmare to choose, I can take a picture on my 1520, when I get home and turn on the Xbox, choose OneDrive the picture is there to be viewed, if I add an album to my music collection on the Surface, it's added to my collection on the Xbox One and with one more click, downloaded to my phone.
So you can see this makes choosing one device a real problem when it's the integration between the devices that makes the system (One that MS should actually make more of an effort to sell) so good.
I suppose its to Xbox One that I actually use most as it's now my main TV/Music/games package, my phone is with me all the time, and my Surface that could almost do everything.
Sod it I would probably go and buy a better laptop, no I wouldn't it would be a Surface 3.
But it's really between the Xbox and the phone, as I can actually do 90% of my entertainment in a clunkier way, it really would have to be the phone, BUT PLEASE don't make me choose :wink:
Bob