New Windows More Secure Than Mac?

Macworld says Vista is More Secure Than Mac
According to a recent post in Macworld, users of Microsoft's new Windows Vista operating system may be more secure than users of the current version (10.4 "Tiger") of Apple's Mac OS X operating system:

I have found the code quality, at least in terms of security, to be much better overall in Vista than Mac OS X 10.4. It is obvious from observing affected components in security patches that Microsoft’s Security Development Lifecycle (SDL) has resulted in fewer vulnerabilities in newly-written code. I hope that more software vendors follow their lead in developing proactive software security development methodologies.