That isn't a direct comparison though because OS X Server and OS X are different beasts really (thought they share an awful lot). Joe Public would just buy "OS X" or in the Windows 7 world Joe Public would have to choose between "Windows 7 Starter/Home Basic/Home Premium/Professional/Enterprise/Ultimate" and in the Windows 8 world "Windows 8/8 Pro/RT" and would have to ask to know the differences between each.

Joe Public would have Home Premium which comes pre-installed with their laptop/is whatever their laptop's factory reset DVD resets their laptop to. Joe Public would barely be aware that there are other versions out there much less the differences between them.

Technically, they can't choose Windows RT since it's the ARM edition and only comes bundled with Windows tablets. I expect almost everyone will get Windows 8, and the "Pro" features will be easy to purchase as an upgrade through the new Windows Store.

That is because Apple is not a big player in the enterprise space like Windows is, thus they don't see the benefit of the same differentiation that they have with OS X server.