Exactly. They are just the differences. If you'd want a technical pro/con of Ubuntu/Debian vs Redhat/Fedora, that is an entirely different post equally as large (perhaps more-so). In summary, from an ease of sysadmin standpoint for large numbers of servers, redhat and the redhat ecosystem (cobbler, pulp, freeipa, sssd, abrtd, kickstart) just beats the living pants off of anything Ubuntu/Debian have. It is much easier to manage thousands of Redhat machines (without building everything custom like google) than it is thousands of Ubuntu/Debian machines. I know this because I've done both as part of my day job.