As someone with TrueNAS SCALE and having been through the mess of TrueCharts, I'd go with Proxmox on the bare metal and have 1 VM for TrueNAS SCALE and another for docker-compose or whatever apps system you want. SCALE is fine as a NAS but the apps system is currently limited and about to completely change; it's just not mature not stable. If you already have a home server running the apps you want and you're only expecting this server to be a NAS, then go ahead with SCALE on bare metal.
As someone with TrueNAS SCALE and having been through the mess of TrueCharts, I'd go with Proxmox on the bare metal and have 1 VM for TrueNAS SCALE and another for docker-compose or whatever apps system you want. SCALE is fine as a NAS but the apps system is currently limited and about to completely change; it's just not mature not stable. If you already have a home server running the apps you want and you're only expecting this server to be a NAS, then go ahead with SCALE on bare metal.