Ubuntu server usage has been growing thanks to AWS AMIs, so actually both have been growing. I think Ubuntu are just going with a more long term approach. Red

Ubuntu server usage has been growing thanks to AWS AMIs, so actually both have been growing. I think Ubuntu are just going with a more long term approach. RedHat just leveraged Oracle compatibility, if you needed Oracle RedHat was and is the only sane choice; but remove the need for Oracle, and Ubuntu is then a very strong competitor.