Potentialy dumb question here, is there any benefit to using btrfs on a non system disk? I'm fairly ignorant on file systems, asfaik btrfs largest benefit is snapshotting, not sure of anyothers.
openSUSE uses BTRFS as the default filesystem for / and if you have any additional disks (for example a separate home) it uses XFS by default. Unless that's changed since the last time I installed.