ZFS is nicer on FreeBSD. Even on the more ZFS-friendly distros it still feels like an after thought. But in FreeBSD it’s as close to being a core part of the OS as it has been since the demise of Solaris and its various OpenSolaris forks.
I say this as someone running ZFS on Linux too. So seen things from both sides of the fence.
It’s hard to explain why it’s a nicer experience though. Maybe someone else can?