"A good case can also be made that Linux is inherently
more stable and secure than Microsoft products, either because it's
based on a better core of code or because it's open source, and
many individuals have a stake in monitoring and making repairs.
However, with all this discussion, there rarely seems to be any
mention of an even more secure and completely free version of UNIX:
BSD. While Linux is the darling of the hacker set, it is far from
the least expensive or even the most secure open source operating
system available. Linux isn't even running on the widest range of
systems. All three of those distinctions belong to an academically
developed version of UNIX that originated at the University of
California, Berkeley and whose various versions are often referred
to collectively as BSD (Berkeley Software Distribution).
Linus Torvalds ' Linux is quite a youngster compared to BSD. At
two decades of age, BSD is as old as the PC and was running in
universities back when Bill Gates was famous for MS-DOS."