FreeBSD is not only of my personal interest, I do earn bread and butter with it. So far I have had only a few projects where I needed Linux: mostly for java projects, some performance critical stuff and HAstuff/clusterfilesystem. However, no one asks when choosing Linux (remembers me of "no one ever got fired for choosing Microsoft/IBM/Oracle..."), whereas my first choice is always BSD, but I have had to come up with good reasons. IMHO it is a bit sad that quite a few of my clients have never heard of it and thus I need to justify though it can be funny because the people I am talking to are mostly without a technical background aka decision makers so when it comes to the technical part of the decision, ultimately the number of CVEs per year is what is probably one of the heavyweight reasons for choosing BSD (also one reason for me of course).
Contrary, for some projects my expertise was not accepted with the reason "if you die, getting (company) support for those unknown systems might be hard. We choose Linux as lots of companies offer support."