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I've been looking at this a lot this week, though I am definitely not an expert.
You can more easily boil this down into two questions.
What is different between FreeBSD and NetBSD?
NetBSD's motto is "Of course it runs NetBSD". It was made to be extremely portable. It is also more focused on security and is supposedly more geared towards developers than the end-user.
FreeBSD was based on 386BSD. It is supposed to perform better and be the most stable operating system. My instructor worked for NASA in 1965 when he was only 17, and then as CIO(?) of a Fortune 500 company, so I imagine he's got some credibility. He would rarely talk about OpenBSD and NetBSD, but would often talk about FreeBSD.
What is different between NetBSD and OpenBSD?
I'm not exactly sure, but my research seems to suggest OpenBSD gets a lot more development than NetBSD, so it's basically a more advanced version. On the development side, OpenBSD uses only open-source software. NetBSD will use closed source third party drivers and
FreeBSD:
Stability
Performance
NetBSD
Security
advantage of closed-source software
OpenBSD
Security!!
Access to every single part of the OS
Hopefully this will help guide your research.
P.S. A lot of people are mentioning that ipsec doesn't come with FreeBSD.
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