For those wanting an OS like Windows, but better, OSX definitely comes in a good position.
I never understood Apple products for a long time, and I always thought OSX was as locked down as their iDevice products, but no, it's powerful and reliable, and caters to both power users/developers and normal people at the same time.
I would recommend people give OSX a shot, maybe get a used Macbook, even a 6 year old Macbook can run the latest OSX without a single problem. You'll have access to all your favourite apps, such as Skype, Photoshop, a large portion of Steam games, but without windows.
Unlike Windows, Apple hasn't been forcing their newer versions of OSX, and have been keeping them up to date. I personally find El Capitan to be a buggy mess, and stay back on Yosemite which is still updated. Unlike Microsoft, Apple sends me a notification at most once every month or two, with no sneaky tactics to trick me into installing it, just a "You might wanna install El Capitan".
For those who are more adventurous, you could try to set up Hackintosh, which is OSX running on standard PC hardware. It's not as flawless as OSX running on a real Mac machine, but you might enjoy having an operating system that respects the user, rather than treats them as idiots and "I know what's best for you so here's windows 10 and you don't get a choice"
Linux distributions such as Ubuntu, Mint and Fedora come in a close second. I ran Fedora on desktop for over 5 years, up until I went back to windows, and later stuck to OSX when I got a Macbook Pro. They're not as polished as OSX, but Ubuntu is starting to come very close to a smooth experience, even offering proprietary codecs and drivers in the installer to prevent hardware problems.