Very robust OS and probably the best for container virtualization. Each container zone or KVM VM leaves on its own zfs file system, which can be snapshotted, rolled back, sent/received incrementally to a remote host. Data sets, like htdocs and db, can live on a separate zpool and given to a zone via lofs. You can build your own packages from sources by using pkgsrc environment and keep the applications up-to-date. The drawback is incompatibility with some hardware and leaving support for Linux LX containers.
Best solid configurable container OS. Can run *nix and Windows with ease. Can use Docker but doesn't need it. Use it on a small server or in a billion dollar data center. ZFS for easy redundancy, backups and container management.
Would have been 10/10, but lost one point for not having nano in the global zone :P
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