📚 Zfs appears to have better compression than Btrfs (Nixos)

I have enabled zstd compression on both systems, identical configuration file,

zfs = 3.8gb and btrfs = 7.8 both at default compression levels

I have verified both are compressing... Maybe I did something wrong?

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ZFS pool as:

zpool create \ -o ashift=12 \ -O mountpoint=none \ -O relatime=on \ -O normalization=formD \ -O encryption=aes-256-gcm \ -O keyformat=passphrase \ -O keylocation=prompt \ -O acltype=posixacl \ -O xattr=sa \ -O compression=zstd \ -R /mnt tank /dev/sdx2 

Btrfs set up with options: compress-force=zstd,noatime