I got 2 tablets with Windows on.
The Linx will install anything I want it to, but the Surface is RT only.
With Windows 10, you can force it to run in tablet mode, and thats what I decided on, and to be honest, I really like it like that... It did originally come with Windows 8 with bing, however, Windows 10 is a fairly small O/S when installed fresh, and I have given them a 64GB MicroSD with the Docs/Pics/Video etc folders, all pointing to the MicroSD so that any apps I throw onto it, all get shoved to the very limited 32GB that they have, I have found that with Windows 10, the tablet has a nicer feel than it would have under 8.1 - I think that is really mainly down to that Tablet mode.