Titled as a Network Engineer, but my minor is in Software Engineering. I've used a myriad of computing platforms to include Linux, UNIX, Mac, PC, Commodore, Amiga, and 286/386/486s. My choice of everyday machines is Mac because it offers a good balance between UNIX power and Windows usability. I am NOT an Apple fanboy. Bottom line, I use Adobe software and refuse to run a Windows environment. Mac is the best balance between the two to accomplish my goals.
Server side, all Linux/UNIX. In my mind it can be beat for performance, scalability, and security.