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Agreed; follow the link the author offers near the top of the article to Secunia. Of a few common OSes I looked at (Red Hat Enterprise 5, Windows XP Pro, Windows 7, OS X), OS X had the fewest advisories for 2009, 2010, and 2011; most vulnerabilities seemed to be of a more benign nature than other OSes.

Perfect? Probably not, but it's still the OS I'm going to recommend to my mom.

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Apple has fewer advisories because it's their standard operating procedure to sit on security bugs for several months and then patch them all at once, even if their contemporaries are patching them as they appear.

If you look at the numbers for OS X as opposed to Windows XP, OS X has 1,544 vulnerabilities in 153 advisories (~10.1 vulns/advisory) and Windows has 472 vulnerabilities in 358 advisories (~1.31 vulns/advisory).

Unless you have a good reason to believe that bugs in Windows are nearly eight times "more unique" than bugs in OS X, please don't compare advisories.

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