But if you're setting up from scratch I can't see how anybody would go with Windows if all options were researched.
That's still going back to looking at what you setting up for. If it involves reliance on mission critical, vertical market software then your OS platform starts being dictated by what the software you need will run on.
As far as the original question goes, I still want to know why being able to run Windows VMs on the Mac is supposed to be such a great idea in a corporate environment. If you do it, you end up with a bunch of Mac workstations you can claim are cheaper to manage than Windows workstations, and all the headaches that go with having a bunch of unmanaged Windows machines.