| Frequently, every system in a network will run the same operating system and distro, so it doesn't matter what is most popular. What matters is what that distro uses.
All of the modern distros have a package management system that allows you to set up a "repository" that contains information on the software and its dependencies. In the case of Red Hat, these repositories contain RPMs: when a system wants to install that software, it will download the dependencies for the software and install them, then download the RPM and install it. In the case of Debian, for instance, it does the same thing, but uses the .deb format instead of RPM.
RPM is used by Red Hat and SUSE, but I believe there are slight differences between these two distributions. Debian and Ubuntu both use .deb.
I agree with daark: set up a local repository and then have all of the systems on your network use it to install software.
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