I've used ZFS (FreeNAS) for quite a few years and find it pretty flawless. Trust it's not too dumb a question but what advantage is there to running ZFS on Linu

I've used ZFS (FreeNAS) for quite a few years and find it pretty flawless. Trust it's not too dumb a question but what advantage is there to running ZFS on Linux when you can run it on variants of Solaris or BSD just fine?