I searched for reviews of all four of the major BSD derived operating systems and in the first page of results found nothing much except out of date reviews for old 4.x releases of OpenBSD and FreeBSD 9.0, typical blogs focusing on comparisons with Linux and the odd phoronix article almost entirely focused mainly on the X.org graphics stack, mesa and drm.
Clearly they're all crap and we should switch to Linux.
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