Ubuntu leads but here comes LinuxMint
While Ubuntu is popular, don't forget CentOS, the Red Hat Enterprise Linux knock off, and there's a distro more popular than CentOS now, LinuxMint, at least in the application testing field, according to Phoronix.com. It now represents 4.3% of users, while CentOS represents 3.4%, according to stats from OpenBenchmarking.org derived from users of the Phoronix test suite. Ubuntu represents 39%. of test suite users.