I have been using, building and administering Windows computers since Windows 98. My favourite version to this day is Windows 2000, since it was a perfect balance of stability, usability, performance and friendliness. All other versions have been either terrible "crash and burn" experiments (Win9x based) or Teletubies edition of same Win2000 (looking at you, Windows XP). I don't count WindowsNT editions, since those were not really intended for consumer market up until Windows 2000. Well, then we also had shiny-glassy-and-fat behemoth called Vista, it's refined and optimised version called Windows 7, and finally "back to Windows 2.0" a.k.a. Windows 8, followed by "Windows 3.11 reborn" Windows 10 (where did the "9" go?).
I have had 1-2 years using Slackware Linux as my main OS some 12-14 years ago... Which was quite fine, actually.
To be frank, I was always a big skeptic towards Apple and Apple fans. Mainly because of those douchebaggings fanboys who would consider themselves messiahs of the One True Faith called "All things Apple" and would not shut up about it. And also because prices of anything Apple were always absurdly big in my country.
But then, just few months back I bought a 2013 MacBook Pro 13" with Retina display for my girlfriend, and as I was preparing and testing it, I could not help but "feel the magic" in the MacOS and the synergy between OS+hardware. And of course aesthetics of it all... I got so curious, I decided to buy 2014 MacBook Pro 13" with Retina display for myself (same as GFs, just one year newer). After a month or so of using it, my experience was still the same pleasant feeling of things just working as they should, the way consumer computers should have been all along. It's just that 13" display and dual-core CPU proved to be insufficient while working with hi-res photos and for spinning virtual machines. So just few days ago I upgraded to 2015 MacBook Pro 15.4" with Retina display. Very pleased with it so far.