I’m a Unix guy. It has been boiling around in my resume for awhile now. At this juncture I’ve now dealt with more Unix and Linux systems than Windows systems.
Granted I still know the hell out of Windows too. For example, I know how to get Windows to route packets destined for certain devices over a certain interface.
But the majority of my experience has now been with Unix and open source tools. And I know how to use Corkscrew to tunnel http connections on Unix too.