There are two camps when it comes to cloud operating stacks. On one side you have the OpenStack crew who believe their products give users the greatest degree of flexibility and deliver the most choice. On the other you have those who claim that Amazon Web Services have already won the public cloud battle and that any private cloud that wishes to succeed should emulate the AWS APIs. Perhaps the person who most typifies this view is Eucalyptus’ CEO Martin Mickos. Eucalyptus is, of course, the private cloud vendor that has long crowed about being the only vendor anointed by AWS to have full access to all the AWS APIs. Indeed I’ve seen Mickos go head to head with with Chris Kemp, co-founder of OpenStack. In the lively debate (see here) Mickos called OpenStack the “Soviet Union of the cloud”.