This is always going back and forth, and they always have different winners and losers. For the time being, though, researchers at Black Hat have said that Microsoft has better security than Mac’s OSX, although OSX Lion has made many improvements. There are always those that say that Windows is so insecure, but Windows 7 has proven many people wrong since it’s release. It is the most secure version of Windows, even when tested.
Escalating privileges remains a problem on both operating systems, Stamos says, with OS X having more potential soft spots than Windows 7. But when it comes to network vulnerabilities, Apple is the loser. "OS X networks are significantly more vulnerable to network privilege escalation," he says. "Almost every OS X server service offers weak or broken authentication mechanisms."