Definitely a hackintosh for single PC allround video work. The quality difference is not a myth. The performance difference isn't either.
If you're looking at very complex video editing techniques like CGI, that require a lot of power to be thrown at it and create absurd big files, you might want to look at a linux machine, but for more generic video work, OSX offers more user friendly applications and easier access to all kinds of proprietary codecs. Example: there are a bunch of plug-ins for Premiere and Final Cut, that can make editing more efficient, and those are not always available on linux systems. If you're going to supersize the video creation effort though, especially if you scale up beyond the power of a single PC for the rendering, definitely go for linux. Cluster rendering, distributed computing, upscaling opencl loads, very high speed PCIe SSD caching, etc... if you want any of that, and you'll know when you need it, and you want it to work, that's linux-only territory.
Windows is the worst platform for video editing ever, there is a lot of performance lowering overhead (archaic slow file systems, RAM cap, DirectX, bad drivers, time consuming updates, fragmenting storage behaviour, performance killing background processes, constant malware checking, etc...), and the video quality is limited (certainly when using acceleration technology, which really ruins the video rendering quality in Windows, basically, CPU rendering is the only option for acceptable quality in Windows, and the maximum quality is lower than on other platforms, so a double loss factor).
A hackintosh is an easy way to get more performance in OSX for a smaller price than buying Apple hardware. OSX is cheap, costs only 19.99 to 29.99 USD, compared to Windows, that quite a huge saving because you'll need a machine with a lot of RAM, which would mean buying a Windows Pro license, and those are very expensive. OSX also keeps you focused, it isn't anywhere near the chaotic clickfest that is Windows 8, and it just works better in every way (faster disk access because of more modern file formats, easier and better backup solutions, network backup and storage access functionality to work directly on NAS storage for instance, etc... all things that are really important for video editing). One thing though: the Apple OSX license states that it can only be used on machines that bear the Apple logo, so in order to use OSX legally on a hackintosh, you have to put an Apple sticker on it (sounds childish, but that's the way Apple's lawyers have put it in the EULA).