The entire data center at NASA headquarters on M street in DC is Mac exclusively. When asked why, their reply was stability. Make all the jokes about spacecraft blowing up that you want, NASA employs smarter people than any company in Cols. There was also a prevalence of Mac equipment at NIST.
Just because more people buy one product, that does not make it better than another. Which car is better, the Corvette, or the Taurus?