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It all depends what you want to do with your computer. If you are running or using one particular program in Windows and maybe you don't know if it is available for the Apple, or you would have to buy a new copy, then you would not want the Apple.
From a business point of view, if there are several people using the computer or computers, then you would have to think about the cost of training users on a new operating system.
One of my main uses of my computer is downloading radio broadcasts that I convert to mp3 and play later in car or office. I have no idea whether the necessary software is available free for Apple, or what it costs.
So I think most people who own a computer and need to replace it are going to go with something that they know will work with the programs they are already running.