Reiser4 is still in development and it is the successor to ReiserFS. It's probably a good idea to rename the filesystem in order to remove as much as possible any historical ties to Hans Reiser. It's time to move on and forget about Hans.
FreeBSD, OpenBSD and NetBSD are for servers, appliance servers and embedded devices mostly. You can use them as a desktop, but that's not where their strengths are. If you want to learn or use FreeBSD in this case I strongly suggest setting up a home server and learn as much as possible.