It's sad that so many people, myself very much included, now stick with OS X merely because ``it's not quite shitty enough to switch''. When I switched to the Mac initially, I switched because it was vastly better option than XP; now, I feel that lead has been eroded and that Windows 10, while different, isn't far behind OS X in most respects.
As far as workflow and window management goes, OS X is a good half decade behind Windows, and in a lot of system-level ways, it feels a decade behind. I use a MBP Retina at work, and it feels primitive compared to Windows 10, which I use everywhere else. Everywhere else, I'm doing audio, video, and photo editing though. If your day to day work is more CLI and *nix oriented, I can understand the appeal of OSX... although some of the variations of Vim that I see people running might as well be GUIs.
Windows 10 is -in my limited experience- awful. Admittedly I don't use it for much more than gaming, light browsing, and occasional ssh sessions but it's painful to use, the apps aren't great, and it frequently craps out with weird error messages (e.g. "The required TCP protocols not installed on this machine" actually meant "The NAS isn't responding").
I switched to OSX originally because the company I was working for was all-Apple. I probably wouldn't have thought XP was shitty enough to change otherwise, even though it obviously was.
Conversely, I'm now working at a company that's all-MS, but even after two years now (albeit, only a month on W10, previously on W7), I'm still not feeling much of a desire to switch to Windows at home. My Macbook is getting pretty old now and I'm going to want to replace it sometime soon and it's going to be another MBP.
The funny thing is I actually switched from OS X to Windows XP, primarily because Apple made me angry when they refused to do anything to continue Classic app support. (If I'm going to lose all of my favorite apps anyway and have to start over, might as well start over on the OS that has 10 times more apps, right?) (Also, I still hold a grudge over the "free forever" .Mac service.)
I wouldn't say Windows 10 is behind OS X at all. In some contexts, like a corporate workplace, it's at least a decade ahead, and always has been. (Then again, Apple and Mac fans generally discount that environment entirely.)
The biggest problem Windows 10 has are:
1. Crummy HighDPI support (and yes, they've been working on this, but the work is WAY too slow-- this should have been solved 5 years ago, guys)
2. Crummy third-party apps, made by developers who have no respect for the OS or its users
3. The new "constantly updates, and occasional ads" philosophy Windows 10 is taking. I wouldn't even mind the ads much if they weren't so stupid. (Stop trying to sell me the copy of Office 365 I ALREADY OWN!)
