Fuck platform advocacy in the ear. It's boring. Windows works, just like OS X works, just like Linux works. Desktop OSes are literally just a matter of taste these days.
Apple converts have a habit of assuming that OS X is The One True Way, and let's be clear: it's really, really not. It's very nice and pretty and all that, but it's also expensive (Apple laptop computers start at £749**), circumscribed and comes with a very, very bad mouse* on computers that are, with the exception of the hilariously expensive bin, modestly-performing laptops.
The value proposition of a Mac is in the design, the build, the end-to-end integration (including with the phone), the OS and UX itself***. This stuff is clearly worth a lot to a lot of people, but there's a whole lot more people who make a different set of value choices; they have a limited budget, or they want performance, or they want a small form factor, or they want to Linux, or they want to play games. A Windows PC can meet all of those requirements (obv not the same PC, that'd be silly) whereas Apple go "Here's your Mac. It is what it is. Buy it. Sell it in three years when the AppleCare runs out, because it's not user-serviceable and it's going to cost you lots to get it fixed."
This is absolutely fine, and it's what I did for three Macs.
But it's not the only or best model for personal computing.
*Oh, man. Apple haven't made a mouse worth the steam off my piss in 25 years.
**Not counting the Mini, as in the previous iteration Apple made it clear they hate it and want it to die. Expect it to be discontinued RSN.
***Although it's increasingly obvious (iTunes, Photos, Safari, etc) that Apple regards the HIG (which once underpinned the enviable UI consistency of the OS X experience) as strictly optional. This sucks and should stop.