We have some experience using Red Hat Satellite in an environment with ~120 servers. Now we're looking into deploying Ubuntu in parallel for the further growth.
How does Landscape compare to Satellite with regards to features and usability?
SnapOverflow
I think one of the main differences is the fact that in Landscape you cannot have off-line install, with your own servers, you have always to be connected to the Landscape servers...
Also, Satellite went open source, called Spacewalk, i would kill for an opensourced Landscape...
Anyway, there's a project for supporting deb files on spacewalk, but I don't know what status does it have...
For Debian based operating systems, you can use apt-dater https://mpdeveloper.blogspot.com/2022/01/apt-dater-los-parches-de-seguridad-es.html