What tablet should i get?

[Ivan]

I don't know whether I should get a Microsoft Surface or a nexus 10.
I would be using them to do work on (which makes the surface better) but would also be watching videos and playing games. I already have a nexus 4 and 7 so I have already invested in android, but I own an Xbox so am involved with microsofts ecosystem. The surface would be better for work as it comes with office and has a keyboard and full sized USB port. But the nexus has more apps availible and a better screen. The other advantage of the surface is the build quality and support as it is made from magnesium not plastic and will be updated for 4 years officially whereas the nexus will get maybe 2 years/3 years. The nexus is over £150 cheaper than the surface with a keyboard.
Also do you think the surface price will drop to £400 with the keyboard in the next six months?
PS by work I mean homework as I still go to school.