- standalone.xml: Support of Java EE Web-Profile plus some extensions like RESTFul Web Services and support for EJB3 remote invocations
- standalone-full.xml: Support of Java EE Full-Profile and all server capabilities without clustering
- standalone-ha.xml: Default profile with clustering capabilities
- standalone-full-ha.xml: Full profile with clustering capabilities
Answer taken from: The Differences Between JBoss EAP 5 and EAP 6