Most of my clients have particularly sensitive information. We tend to run on-premises rather than the cloud because of security issues for those highly sensitive databases. We disconnect those databases from the internet so they are ultimately secure. That is something that you cannot do in the cloud.
Red Hat Enterprise Linux doesn't have any particular standout security features, which the other Linux tools don't have. I've also used the Oracle version of Linux, which seems very similar to Red Hat Enterprise Linux. Both seem to be as secure as the other. If I have to give a score in relation to stability, Oracle's version of Linux might be slightly more stable than Red Hat Enterprise Linux.
All the customers I've worked for have been using those operating systems for a long time. For instance, one of our customers has been using Red Hat Enterprise Linux since it was first available over 20 years ago. A return from that is difficult. They were using Unix rather than Linux. The applications they ran were ported from those environments, and migrating them to Red Hat Enterprise Linux was relatively painless. We did those migrations back in 1995 to 1997.
We tend to use the environment for running databases. So, we have very few real users directly connecting to the system. The people who connect to the system do so by applications.
We haven't needed any maintenance for a long time. My last company was a large organization, and we had the internal expertise to provide support. Some net contributors have fixed bugs themselves and contributed those bug fixes back into the Linux open-source community. It was a huge organization, and its IT department was as big as some software consultancies.
Overall, I rate Red Hat Enterprise Linux a six out of ten.