"Apple's OS X, which has been an official certified Unix system
for some time now, is often installed onto Internet-exposed or
intranet-only Web servers for serving up dynamic content. I've
worked with such configurations for a couple of years, and with
GNU/Linux alternatives for even longer. There are at least three
reasons why GNU/Linux systems do the job better.
"Web servers are key corporate assets, and systems
administrators are supposed to keep them humming along, but that's
not always easy. Security is always an issue for sites, as shown by
daily vulnerability reports and security advisories..."