BTW, “P.C.” and “Windows” are not synonymous.
One is hardware. The other is an O.S.
(One of many O.S.’s!)
"PC" has a lot of different definitions depending on context. By one definition, it's an affordable desktop or laptop computer -- a definition that includes Macs. By another definition, it's an "IBM compatible" computer. By yet another, it's a computer with an Intel or compatible processor capable of running Windows -- which, again, includes Macs. By the strictest definition, a Personal Computer is (was) one made by International Business Machines, Inc., which trademarked the term.
The useful comparison is between Mac OS and Windows. If you're comparing hardware, then you're comparing Macs to other PCs on a component and cost level, which is a valid argument to have, but not one I find terribly interesting.