RHEL's quality assurance and documentation is top-notch. Ubuntu has been improving, but it's not anywhere as good (which makes sense - Red Hat has much more peo

RHEL's quality assurance and documentation is top-notch. Ubuntu has been improving, but it's not anywhere as good (which makes sense - Red Hat has much more people working on it). Support is expensive, but worth it. It's not unheard of to get custom kernel patches mere days after you reported an issue. Well, that and the ecosystem of enterprise software which refuse to run on anything but RHEL. And Ubuntu's failure to establish their home-grown stuff: Upstart, Unity, Mir, Ubuntu One, Ubuntu Phone, Juju... That being said, 18.04 is a lot better than 12.04 or 14.04. I'm a Red Hat fan, but I hope Canonical succeeds - the more independent companies there are, the better.