I use OS X, Windows 10 and Gnome 3 pretty much every day. They're all okay. I like Gnome best, and Windows least. But they all do the job, and they're way more similar than they are different. In contrast, 10 to 15 years ago, the user experience was wildly different on each of them.
But it's moot anyway. Browser apps will continue to displace desktop apps, and they don't really care which operating system you're running. European governments would be well served to somehow supply their administrations (as well as the general public) with a first-class alternative to Google Docs. Extra requirements: self-hostable, (even more) extensible.
Many people in administration don't need much more from their office suite than regular users. Many others do, though, I agree -- hence the extensible part. Either make the extensions by dedicated government IT staff or pay someone to do it; open-source either way, obviously, because it's absurd to use public funds to commission proprietary software.
But it's moot anyway. Browser apps will continue to displace desktop apps, and they don't really care which operating system you're running. European governments would be well served to somehow supply their administrations (as well as the general public) with a first-class alternative to Google Docs. Extra requirements: self-hostable, (even more) extensible.