[cookiecaper]

Because Mac OS doesn't straddle the worlds perfectly well. It's definitely more compatible than Windows/Cygwin, but you still spend a lot of time trying to get things to work and/or compile correctly on OS X that would work effectively "out of the box" on a Linux machine. A recent hire has insisted on using a Mac OS workstation and his install time for new tech stacks is through the roof when compared to developers on Linux workstations.

[eaparnell]

Yes, that has been my experience. Most tech stacks I use install better under Linux. Even if I were using a Mac as the host OS, I will still run Linux as a VM.