NT-vs-UNIX

[Chris Cariffe]

Oh i knew this time would come in my career sooner or later.  I have a
client that is persistent in putting an MS-DNS for their external services.
 I know their reasoning (point-click) now I need to come up with a list of
reasons why I would rather install BIND on a UNIX system.  Security is what
comes to mind for me and greater system control down to the kernel.  How
about you out there?  what do you all think?