The two things that made me install FreeBSD rather than OpenBSD was (1) the better hardware support when it comes to Intel-derived architectures, and (2) not as opinionated and, frankly, in many cases plain rude, project leads.
From a technical and documentation standpoint, OpenBSD is utterly fantastic and FreeBSD is doing its best to get ahead.
Give OpenBSD a try. Of the BSDs I've tried, it's the one that feels the most "tasteful", if that makes sense. Everything in the base system is well-documented, well-executed and feels consistent, and most things just do the right thing with minimal configuration.
But with BSD, inspite of being very interested in it, I have not been able to pick one due to analysis paralysis. If I have enough time only to spend time with one of the BSDs, what possible criteria should I use to evaluate them against one another and pick one?