FreePBX Distro 7 is currently Stable and Production ready.

FreePBX 14 requires more modern software than is historically provided with the Long-Term-Stable RHEL based releases.  FreePBX Distro 7 provides all the stability of a RHEL7 based Distribution, with the flexibility of hand-picked and maintained modern packages.

FreePBX Distro 7 is the recommended environment for FreePBX 14.