A History Lesson
This thread is beginning to sound like a arguments I used to have when I was 10, e.g spectrum vs commodore 64
For info, the term PC pre-dates the original IBM type 5150 machine ,which was the first modern 8088 based machine, by about 9 years. The difference was that IBM used off-the-shelf parts and an off the shelf OS from a small company called microsoft which it rebadged.
Because it used off the shelf parts it was possible to clone the IBM machines and produce them without the huge price markup that BigBlue put on them. After some unsuccesful attempts to stop these copies being made, the floodgates were opened and anybody could start churning out IBM-Compatible machines, you could say that they were the original open-source computer.
Unfortunetly the person that really made the money was a Mr B Gates est. because he made the software that your cheap clone ran.
So perhaps the actual advert should be
Personal Computer derived from an original IBM machine running a Microsoft Operating system vs Mac OSX
OK so it's not that snappy. But that's why I'm not in advertising.