PC-BSD is a desktop-oriented full FreeBSD distribution... y use freeBSD, just google it ?
its easier to install than most linux distribution...
KDE is the desktop used.
flash drive mounting is automatic.
MP3 is supported by default (ubuntu or suse dont have it, you have to download it yourself)
it comes with nvidia driver already shipped if you happen to have a geforce
less confusing than linux since there is only one FreeBSD, you have one reference most of the time
it's a customized FreeBSD, not a fork
try it.
PC-BSD - Home