As someone who's used btrfs and zfs, btrfs today is still a pale imitation of what zfs was at launch. btrfs feels like people wanted to make a filesystem which had all the 'pretty neat' features of ZFS but without the tightly coupled management and benefits of ZFS (like volume management + RAID + encryption + compression all being managed through one tool).
btrfs ended up being basically a consumer version of a few of ZFS's most visible features - transparent compression, subvolumes, and copy-on-write - which then farms out the other most useful features - RAID + volume management + encryption - to the existing tooling. Makes sense for a smaller-scale project, no shade, but it definitely misses the mark if you've spent time on ZFS systems taking advantage of what ZFS has to offer (like recursive snapshots or vdevs).
btrfs ended up being basically a consumer version of a few of ZFS's most visible features - transparent compression, subvolumes, and copy-on-write - which then farms out the other most useful features - RAID + volume management + encryption - to the existing tooling. Makes sense for a smaller-scale project, no shade, but it definitely misses the mark if you've spent time on ZFS systems taking advantage of what ZFS has to offer (like recursive snapshots or vdevs).