Fedora stops supplying you with any updates after ~1.5 years, RHEL (and theoretically CentOS) will support you for 10 years. Not only this but the software gets

Fedora stops supplying you with any updates after ~1.5 years, RHEL (and theoretically CentOS) will support you for 10 years. Not only this but the software gets through extremely vigorous QA, certifications etc, unlike Fedora (and many other distros). Fedora is the development workhorse from which RHEL versions are spawned and hardened. In short, want to run a mission critical application for many years? Go RHEL (or CentOS if you do not care about support and extra bits or cannot afford it). Want more bleeding edge stuff and faster paced development and updates? Go Fedora.