

Are you using RAID at all? If so ZFS is probably the way to go. If not I think it matters less whether you use either btrfs or ZFS.
Regarding btrfs and power loss:
…btrfs is designed to only experience data loss not corruption, assuming well behaving hardware in power outage scenario. In practice ZFS has more maturity overall (definately) so may be better (my speculation).
Beyond direct comparisons if you already have on and offline backups then you are protected from power corruption and only have to worry about data loss anyway?
This was an interesting read - not often I’ke seen orgs talk about this side of things openly. It would be good for FOSS orgs to share knowledge and threats to help all defend from spurious legal attacks.