But to be fair, Pivotal Cloud Foundry is so expensive it's not even in the same league as the others and I can totally understand why the article just ignored it altogether.
OSS Cloud Foundry is free, and so is BOSH. A lot of companies use those and are perfectly happy with them.
Red Hat OpenShift undercuts us on price, I think largely because they figure they'll get to do the razors/razorblade thing with RHEL riding in behind it.