There is no single criterion by which you can decide which distro is better. All I know is anecdotes. RHEL 7 and Ubuntu 14.04 came out around the same time. Ar

There is no single criterion by which you can decide which distro is better. All I know is anecdotes. RHEL 7 and Ubuntu 14.04 came out around the same time. Around May, upstream QEMU started getting bug reports from Canonical developers that you couldn't reset a virtual machine that had been created in 12.04 and migrated to 14.04 due to some firmware incompatibility. In RHEL we had started testing cross-version migration 6 months in advance.