Whichever you choose, Linux is the easiest to use and manage but here is a bit of a comparison.
Linux is the easiest to use, I find Slackware to be the best (http://www.slackware.com
BSD's seem strange to me, but the main thing is that BSD's such as FreeBSD (http://freebsd.org
) are HARD to setup, it is text-based and complicated, where you have to manually edit many things and configure a kernel.
Whilst Slackware is a snap to install, the Setup program is simply straightforward and there is plenty of documentation, such as http://www.slackbook.org
or user created ones like http://insyte.uni.cc
Even though it is text based it is not hard.
Package management is easy with Slackware, http://linuxpackages.net
has a huge archive of software to download, and you can intall it by just invoking the command:
As far as I know there is no FreeBSD or any other BSD Live CD, yet for Linux there is plenty, go to http://slax.org
for a Slackware based Live CD.
Hope that gives you more info.