JBossDeveloper

BA with less technical knowledge but more of functional knowledge try to map business requirements into process model.
Technical guy deals with technical aspects of process like integration with other applications.
Intalio uses BPMN as process modeling language. got 52 BPMN notations (standard). When Intalio designer deploys process on the server it deploys as "BPEL" process.
If anyone has taken look at intalio, will understand how complex this tool has become by making it BA friendly. Error Resolving is difficult task. User Interface its not at all satisfactory. Integration with other open source products like "Liferay portal for UI" is needed to have better look and feel.
Data Mapper given but its complex to understand that BA will prefer to write Database adapter himself. :)...

Again the workflow form designer is again the same case.
What you can say overall is "Intalio Designer" has made process modeling easier task but it consumes lot of time to understand that designer itself. whereas jbpm xml is quite easy to read and understand.
One more advantage over Intalio jbpm has, is JPDL can be created by using any XML editor. To understand 52 BPMN notations in terms of XML tags is not that easy. SO you need to have "Intalio Designer" to design process.
Customization in JBPM is easy; having advantage over Intalio.
Web services can easily be created using Axis API So not a big deal.
And one more thing you can always create custom nodes in jBPM. Tell your BA about your custom nodes and put in JPDL while modeling process. (one time effort but worth of it). Create db node, email node, web service node and just tell BA to use it... its not that difficult to modify XML file.

jBPM
 Database query can be done through developer no component available
 Needs to develop separate forms and then deploy
 Swimlanes are present but cannot visualize them.
 symbols present are 10
 More developer centric. Control is given to developers
 Business rule management strong support. Drool or JBoss Rules.
 Again no BPMN standards. Own PDL.
 BAM (Business Activity Monitoring) for available but not to great extent


Intalio
 Db component is present but requires lots of configuration, mappings, xml schema elements and so on
 No need to create separately and then deploy.
 Symbols present are 52 out of which 12 are used.
 Import Support for ArisXML, BPEL.
 Integrated with OpenLexicon rule engine needs to install separately. Drools based.
 In platinum and gold versions BAM is present.
 Poor version controlling in both
 Easy LDAP Support