in the compare document there is a statement:
We built Data Center with these customers in mind. Data Center provides organizations with a variety of key features including high availability, performance at scale, instant scalability, deployment flexibility, disaster recovery, SAML, and infrastructure control. You can deploy Data Center behind your firewall using a host of technologies like VMWare or bare metal, or you can run it on IaaS like AWS, allowing you to reduce administrative costs of your infrastructure, but still maintain control over your data.
So is it true only for Data Center? In particular is SAML not supported by Server version? Can I install JRA in cloud on AWS?
Yes you can. The main difference between datacenter and server in high availability, performance and scalability.
You can also check this answer and links for more detailed info
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