Based on the title the author is an oddity. Macs are PCs. And windows 10 is safer right now. To much stuff atm on OSX out there for hackers to exploit.
Less than a decade ago, an Apple computer and an IBM PC or its clones were entirely different architecture. While that hasn't been the case since 2006, in the public consciousness they're still different, and the definition of "PC" has subtly shifted to mean "computer running Windows."
To answer the question in the article, between OS X and Windows, OS X is intrinsically more secure, as are all operating systems based on UNIX, such as Linux and BSD. The last is a particularly secure flavour of UNIX, and also happens to be the OS that OS X is derived from. UNIX is designed from the ground up to be a multi-user system, which means that the damage that can be done by a virus or malware is generally limited to the user who introduced it.
That's assuming the user doesn't do something stupid like grant the malware some kind of superuser access. The end user is often the weakest link in any security scheme.