If you use ZFS you only have snapshots for this. cp --reflink also has some gotchas on btrfs - if you do a balance it's not preserved and there are some odd problems with snaphots (I have no link at hand, take a look at the mailing list)
ZFS is not comparable to btrfs at the moment. Everything device related is missing on btrfs. No detection of missing or broken devices in btrfs at the moment, no hotspare functionality, btrfs RAID1 uses the pid to decide with disk to read from. RAID5/6 is still experimental and there are some odd behaviours.
Using btrfs for production is a risky bet and may very well bite you. The tooling is terrible at the moment (IMHO) and benchmarks favour ZFS most of the time.
ZFS is not comparable to btrfs at the moment. Everything device related is missing on btrfs. No detection of missing or broken devices in btrfs at the moment, no hotspare functionality, btrfs RAID1 uses the pid to decide with disk to read from. RAID5/6 is still experimental and there are some odd behaviours.
Using btrfs for production is a risky bet and may very well bite you. The tooling is terrible at the moment (IMHO) and benchmarks favour ZFS most of the time.