The report that Google might be dumping Windows for Mac and Linux because of security concerns has raised that age-old question - What's the most secure OS?
Personally, while I think that it's interesting to try to read between the lines and guess why Google might have made this switch (if indeed it has), the bottom line is that the company is doing what it thinks is best. Same with individuals and smaller businesses. We make decisions like this based on our experiences, knowledge and bias (yes, bias comes into the equation ... deal with it).
With that in mind, let's ask the obvious question ...
Reasoned arguments only, please!!!
My take is that the answer to this question revolves around what OS you know most about and are comfortable with. Remember too, that beyond security, you do, in a business environment at any rate, have to think about productivity. Also, remember too that one of the weakest links in the security chain is not the tech, but the person sitting in the chair in front of the tech! Education is one of the most effective weapons in the fight against hackers.