I wouldn't touch Windows 8 with a 10 foot pole. I still remember this video from a month or so before launch:
I have been using Linux for 15 years and every other operating system seems so limited in comparison once I got used to all the standard UNIX tools and the bash shell (of course in addition to the GUI).
Microsoft has had horrible user interfaces in Windows as long as I can remember. Funniest was the file manager in Windows 3.1 and 95 that wide enough for about 8 characters in each filename to be displayed so that it was such a nightmare to browse.