BTRFS allows you to add, remove drives, and change RAID levels <i>on a mounted filesystem</i>, while able to use differently sized drives efficiently. That alone wins me over. Some people still say BTRFS isn&#x27;t ready for production, but I&#x27;ve had fewer problems with it than with ZFS (YMMV). Still, I don&#x27;t care much as I have multiple backups.