We use Windows 7 and RHEL when working, Windows 8 on the desktop PC for gaming at home, along with Ubuntu and OS X on the MacBook Air, Debian on a small server at home and for casual web surfing ChromeBook.
We mostly prefer Windows 8 thanks to the compatibility along with the fact that it makes sense to put this on a desktop computer that needs high end hardware, such as when photo editing and playing games.
The Metro interface is not really an issue.
The desktop is mostly used and the just type feature on the start screen is very fast for opening up apps. All you need to do is hit the Win key and start typing.
This is not so different from the Unity Dash and Quicksilver.
They like Mac OS X as they have been long time users of Apple Macs and they are used to UI and hardware.
The Mac OS X happens to be the best runner up when it comes to 3rd party software.
It is less useful when using the command line, as Linus is, and does not make a great server for more than the easy things that you can turn on; however as a general OS it is good.
Linux Distros and Ubuntu are liked for many reasons. They both come free as they are Open Source.
Linux is superb if you are a developer of power user as you can customise it as much as you want. Of course you have to learn how to do this and you do have to put some time into it.
Some of the default interfaces link Unity are great, however not everyone likes this.
For the average user Liniux needs polishing up a little.
It could do with some of the UI improving and it is not easy to recover from when something goes wrong.
It is certainly not for everyone, however power users do like the openness that Linux offers and it comes with possibilities that are endless.
It is able to run anywhere and it is worth having Linux skills, it also makes a superb server OS.
It is cheap and it is also reliable and it is also very easy to manage.
Chrome OS and Chronium are limited; however it does do what it does very well.
These two are superb if you live on the net, however for localised work there are some limitations.
It does happen to be growing more capable as it goes on and there is Chrome Native Client, which is great for running more native code.
Power users can also go into developer mode so as to access the terminal and install change root, chroot, which then makes things easier for installing Linux apps.
Anyone with a Mac has the chance to try them all to see which of these they prefer.