What I’ve realized in my (very limited) experience in selfhosting, it’s always best to use a general purpose server OS rather than anything geared to a specific usecase, unless that’s the only thing you’re gonna use it for. So, if you want a separate NAS drive, then it’s a good idea to use TrueNAS on it. But on your main server, it’ll be best to use some sort of RHEL downstream distro like AlmaLinux.