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.
For a data disk? Absolutely, even if you're not going to configure anything, you can copy inside the partition instantly and detect the bitrot.
If you're willing to step it up a notch, there's also cool stuff like transparent compression, deduplication and incremental send/receive of entire subvolumes.