To be clear, rsync.net zfs should work with any/all shell or script-based ZFS replication tools. The basic documentation for zrepl here is good, but you can also use sanoid/syncoid, zsnapzend, etc.
I haven't personally used any tool besides zrepl, but I like the flexibility it offers. It can do both push and pull-based replication. I have my offsite target server (with its own retention policy) pull from the source server. If the source ever gets ransomwared, it can't encrypt/delete all the existing snapshots on the target.
And another huge benefit for my setup is the ability to use an HTTPS connection for the replication instead of SSH. My source and target servers are in different continents so there's pretty big latency. zrepl's HTTPS server manages to transfer data at ~890Mbps while SSH doesn't deal with the high latency as well and only manages ~190Mbps.
