Container vs VM

I currently have my openwrt router as a container in proxmox and it is working generally without issue. It is an unprivileged container which I believe adds a level of security between the container and the host but I read (somewhere) that if I wanted to attempt a sysupgrade of openwrt within the container that there is a possibility I might overwrite some host files.

So now I am wondering if I should be running openwrt as a vm instead in the event I want to upgrade/overwrite my openwrt...

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