As a Linux sys admin I spend all day looking after Linux boxes (funnily enough) and also get to do all the usual stuff on a Windows box. At home I've got a Mac.
In short I got a bit fed up with looking after Windows PC at home, plus when Microsoft (and various peripheral manufacturers) decided to try and flog more kit when Vista came out it was the straw that broke the camel's back. So I purchased a Mac.
The up side is there is generally less messing about and I can just get on and do stuff. Everything I need to do I now have suitable applications for. Though I have VMs with various Windows and Linux if I ever need to do something different. Having a UNIX command line to drop down to is pretty handy every so often. And my first Mac lasted 6 years before I decided to upgrade before it could no longer get the latest MacOS.
The down side to Mac is that they cost a small fortune, and now are increasingly difficult/expensive to repair yourself. Also if you want to play any more recent games, then you may be out of luck. Though I'm now playing Elite: Dangerous OK, however I must mention that performance under Windows (via Bootcamp) on the same hardware was a bit better.