I went from OMV, to TrueNAS, to just mounting the drives directly on my Proxmox host, combining them with mergerfs, and then sharing them from a samba container they’re bind-mounted to.
Unless you have some fairly complex storage needs I’d say go with a good hypervisor over a dedicated storage OS with a hypervisor tacked on.
It’s honestly less complicated in the end. I’d say probably 95% of people don’t really have a need for a dedicated storage OS because everything they want to do is easily accomplished on any Linux install.
If you’re only wanting to use Docker and don’t need to run VMs I’d just use Debian, and even then you could still run VMs if you really want to.