ZFS has been in production use for almost 20 years now. BTRFS is not fully fit for production, according to BTRFS: https://btrfs.readthedocs.io/en/latest/btrfs

ZFS has been in production use for almost 20 years now. BTRFS is not fully fit for production, according to BTRFS: https://btrfs.readthedocs.io/en/latest/btrfs-man5.html#raid56-status-and-recommended-practices https://btrfs.readthedocs.io/en/latest/btrfs-man5.html#raid5... Some simple use-cases are arguably production ready with BTRFS, YMMV.