The parts used in Macs are exactly the same hardware as PC(s). A looong time ago apple used powerpc processors and those times the hardware was different. I was simply referring to the operating system.I agree, cannot compare hard specs like pc vs Mac . If anything it seems like some inexpensive PC companies inflate their specifications instead.
With that said a thing that Mac can't PC in is upgrades and customization. You can't choose your processor, video card, or motherboard. The couple options they are is what you get.
If you wanted a GTX 980ti with a i7-4790k you couldn't do that. Even though technically the i7-4790k should work on the mac. The BIOS doesn't support it because of Apple's own choice. This limits your hardware options.
Not sure about "PC companies" cause many just build their own PC.

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