If you already have a mac, install windows on your mac to test it out!
But if you are used to macs you will probably hate windows.
Even though mac os is better imo I was once a windows user and i hated switching to macs because I was used to windows. Of course most people on gaming forums only care about games, and it's the only thing windows does better.
The most important thing in mac os is that its coherent, unlike windows, I learned computing on windows, im used to it , but it still feels awkward.
Personally I prefer linux, but this thread is mac vs windows...
Final verdict:
Ease of use, peace of mind: mac
Gaming : Windows
Cool and manly: linux