An interesting article by Klara Systems:

1. Different problems:

Ceph is built for distributed storage across many servers; ZFS optimizes performance, reliability, and simplicity on a single system.
2. Distributed = overhead:

Ceph scales horizontally and survives multiple node failures, but adds networking, coordination, and management complexity that raises latency.
3. Most don’t need it:

Modern ZFS delivers strong capacity, performance, and availability with far less operational complexity — a solid fit for virtualization, databases, backups, and enterprise storage.

https://klarasystems.com/articles/zfs-vs-ceph-do-you-actually-need-ceph/