(d) all of the above
I've a dual boot Windows 10 and Manjaro Linux with GNOME.
I use Windows only for playing games and the occasional Netflix.
I use Manjaro Linux for everything else. I'm very used to the terminal and all of my office work and personal work happens on Linux.
Presuming we're talking personal computer desktop OSs here, I've used:
I've also fiddled with straight Debian, openSUSE, and CentOS, all for servers on my local or work networks, not the desktop thing.
When I finish my current relocation, my home/dev network will again include: Windows 7 laptop (active only for testing), Windows 10 laptop (my bride's except when I hijack it for testing), Linux Mint 17.3 laptop (backup dev box synched to svn for dev work), Linux Mint 17.3 notebook (main dev box), ASUS and Dell Linux Mint 17.3 netbooks (backup, travel boxes synched to svn). On my Mint laptop and notebook, I also run Windows XP and 7 VMs as well as the most current Kali.
I haven't seriously relied on Windows for over a decade. Never much with the Apple line; I've won or been awarded several iPod shuffles all of which died. I still have an iPad mini that I won. It's unlikely I'd ever consider living or programming on Apple.
Short answer is that I will likely always own a Windows box, since I'm hitched to a Windows gal, and it serves some testing ends, but my own work and personal needs will be fulfilled on a Linux box of some flavor or other.
It's amazing to know that most people voting here are on a Linux OS. I believe that the developer should do all development on a GNU/Linux distribution.
Lately a lot of Windows because of certain programs, however I usually prefer Gentoo Linux on my desktop, and KaOS on my old i3 380M laptop (though I want to try Clear Linux on that one).
I don't like Windows because of all the telemetry, and Windows 10 is always getting in the way, like opening new programs in the foreground, even though I changed the focus, fragmented program installation instead of one package manager with all the automation goodies, etc. (yes, I use Chocolatey, the package manager for Windows, already). Also, I hate the explorer, as it seems to hang easily, even if I select to use one process per Window. For example, it kills all processes when the window with the SMB share dies. To top it off, 80% of the time, Windows breaks or even gets a Blue Screen on regular shutdown, so I always have to press the power button 4 sec., which is not really good for my data. That plus their update disasters turns me away from Windows. So much frustration.
Even though I have the least experience with macOS, I know that I don't like it. Mainly because it is a walled garden. Their UI is missing so many low-level options, and I have to install apps they approve, and I have to pay a lot for their hardware and services, while they give me a slightly modified BSD on special-purpose, average-spec hardware. I do like Apple for many things, but I cannot bring myself to buy or use their products.
Which leaves me with Illumos (Unix, for example OpenIndiana), BSD (like FreeBSD) and Linux (everybody knows Ubuntu, right?). In order to quench my gaming needs, though, Linux is the only real option here, because of driver support. Wine stems the actual programs mostly anyway, and is available on all platforms, so I didn't really want to list it - though it's harder to use on non-Linux platforms with less community support available.
By the way, I use Debian Linux on my servers and OmniOS on my NAS, though I want to switch over to FreeBSD for servers.
Dual boot Windows and Ubuntu.
Windows for several reasons, mainly because I can play games on it, some tools work better on it, and some legal work is easier to do on it. (Long story short, Win is supported, Linux isn't)
I kind of use Linux as a private space and Windows as a work machine even though I dislike how they do some stuff.
Mohammed Ismail Ansari
Computer & Technology Enthusiast
Though I'm currently using MacOS on my personal workstation and Windows 10 at work (do not have a control on it), I still have a Fedora VM setup on my personal MacBook Pro. That's my personal choice of operating system due to it being extensible (Linux) and stable (coming from Red Hat).