Open Source Document Management System | OpenKM

What are the advantages of installing Mac OS instead of Windows? I've seen a lot of people use Mac OS instead of Windows, so i wanted to know what are the advantages? most of the people I've seen using Mac where doing photo shop or AE works. why they use Mac?
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market samurai ~ marketsamurai ~ marketsamurai.com

I don't know which is the interest on this kind of discussion and which is the relation to OpenKM ?