Definitely FreeBSD, because it's solid, has thousands of ports, and well,
is BSD... And I access it via my MacBook :-)
Be aware, though, that its mailing lists appear to be spam magnets i.e.
anyone can post, not just members, and there is no attempt at moderation.
--
Dave Horsfall DTM (VK2KFU) "Those who don't understand security will
suffer."