I went from using Windows (which I'd used since Windows 3.1 right up until 8.1), to Ubuntu (which I used for about 6 months on a Dell XPS), to OSx (which I've used for almost 2 years).
I don't have any particular loyalty to the operating system, I just wanted to remove barriers and make things easier for myself by using the same tools as my fellow developers.
The 6 month's of Ubuntu was fine, for the most part, but I really didn't get on with the touchpad or keyboard of the XPS, and it just lacked a certain polish that both Windows and OSx had. (I think I made a post about it somewhere, but I CBA to look for it).
Going forward, however, seeing as my employer will be supplying my computers from here on in, I'll be using what the company uses, which currently is OSx. I'd not have a problem switching back to a Linux system (someone somewhere mentioned Elementraly), but I'd need to find alternatives to some of the mac only tools that I use.