Question: Should your server use FreeBSD or CentOS as the operating system?
Answer: The answer to this question can vary. It really depends on which of the two operating system you are most comfortable with. If your business is more comfortable with CentOS than you should use CentOS. If your business is more familiar and uses FreeBSD more than you should choose FreeBSD.
When it is time to decide on an operating system for your server. You should choose the operating system that your business or organization is more familiar with. If you choose an operating system that your organization has no understanding of than it will be more difficult to manage.