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Apart from the culture that exists in the design world being the reason people interested in design first choose a Mac, the key technical reason is that the Mac has superior font management. The designers at my work cite this as the only thing really keeping them from making the transition away from OSX as it becomes less focused on professional users with every new version.
In terms of photo editing / processing PS and Lightroom and other smaller packages are virtually identical on Windows and Mac.
Just to qualify my opinion I work for a design/film company where the entire graphic design department use Macs (also my GF who is a designer) and for post production we primarily run Linux for 3D/VFX with a bit of Windows and Macs for comp and edit. On any given day I could use any or all of these OSs depending on what I'm doing.
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