I don't know ZFS, I have been using Btrfs for years (desktop, simple setup). Defragmentation in Btrfs is not without issues. If you use subvolume (and I use Btr

I don't know ZFS, I have been using Btrfs for years (desktop, simple setup). Defragmentation in Btrfs is not without issues. If you use subvolume (and I use Btrfs for subvolumes) and in particular snapshots, defragmenting a subvolume will deduplicate its files, increasing disk usage. On the other hand, I have not had much need for defragmenting.