Re: Macs at work: need or preference?
It's a good question. Apple has a lot of devoted fans-- but it also has a lot of devoted detractors who consider Apple a marketing company that happens to make devices.
In terms of software titles, I think the Mac's advantage is pretty small, and confined to specific industries. A lot of media professionals prefer Mac, but I'm not sure it has much to do with Final Cut these days; it seems a lot of people still use Macs but have moved over to Adobe. Certainly, the number of companies who need OS X-exclusive software is dwarfed by the number of companies who need Windows software. That said, within those companies, not all employees are equally tethered to Windows, and among those who aren't, many might prefer a Mac.
I think there's something to Apple's software-hardware fusion. Maybe my experience isn't representative, but I've had lesser-specced Macs that outperformed newer, faster Windows machines. Whether you prefer OS X or Windows is more subjective and more dependent on the kind of work you do. But for knowledge workers and multi-taskers, some OS X features – such as Spaces – could make people more productive.
All that said, Macs are expensive. Based on the JAMF survey and a similar survey Parallels recent released, Macs also seem to be a management headache for a number of IT pros (though FWIW, when JAMF or Parallels points out that sort of data point, it's arguably intrinsically self-serving, since it points out a need for their products). Still, Tim Cook has been more ostentatious about enterprise-oriented features than Steve Jobs ever was, so maybe Apple will help to mitigate some of these headaches. Microsoft is starting to do its part, since its mobility suite can manage iOS devices in addition to Windows ones.