I use and vote Debian. Stable and minimal install out of the box.
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If you want stability then you should go with Debian
Linux but neither Fedora nor Ubuntu I would suggest. Fedora is not a good fit for server I believe and Ubuntu the worse Debian.
Proxmox as main host, most guest VMs are Debian stable with a select few being Alpine
Debian. Always Debian.
Really depends on your use case.
Unraid is wonderful and easy to use. But really has two reasons to use it:Unraid Array fits your file storage strategy. (few writes, mainly reads)You want an EZ way to get into docker and use the unraid appstore.
Other than that, you can probably find everything on Debian or Ubuntu. (I prefer Debian for services)
You can add one more:
Proxmox and then run a Debian VM for docker, for example, and compartmentalize other things you may want to run.
Also, download a mem test utility and run it overnight to test your hardware.