> Come to think of it, why is SUSE considered as a serious replacement for RHEL and not Ubuntu? SLES and RHEL are somewhat similar, in that they both use the R

> Come to think of it, why is SUSE considered as a serious replacement for RHEL and not Ubuntu? SLES and RHEL are somewhat similar, in that they both use the RPM package format, and they both have a 10 year support lifecycle. They are not entirely compatible though. They also make management software that is supposed to be as interoperable as possible with competitor distributions. Anyways, last month SUSE announced they would be making an actual RHEL fork, so that's the real reason they are joining this new partnership -- it's not related to SLES, but a new distro they are making. As for Ubuntu -- it is often touted as an alternative to RHEL. However, people don't like the weird ways in which Ubuntu diverges from the rest of the Linux community (Snap, LXD, ufw, etc.), so some attention is diverted towards Debian and RHEL, which are more focused on packaging software that is already proven. Red Hat does their innovation in Fedora, waits a few years to see if it catches on, then implements it in RHEL. This tends to have a greater degree of success than pushing it suddenly on users like Ubuntu does.