Windows 7 all the way.... on 3 PCs and a laptop.

Windows 8 is just a part of the same old MS bad-good cycle:
Windows 2000 - Good
Windows ME - Horrible
Windows XP - Great
Windows Vista - Bad
Windows 7 - Awesome
Windows 8 - Problematic

At least the good ones are always getting better and the bad ones are getting less crappy..... Windows 8 is mostly fine with Start8 installed.