Something to consider, advice given to me, is that ZFS support on Linux regularly breaks with newest kernels so if you go for ZFS long term, be prepared to run a lts kernel at least as a backup.
I use both. LUKS+btrfs being nice on the Arch desktops, and ZFS on a serverside pool, managed by a TrueNAS Scale VM.
No more security updates, so it will gradually become unsafe to use online.