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You have many tools to use in a composite, and they may overlap for some cases. Mediator is particularly useful for content based routing of events, and as a listener for events. BPEL of course offers more possibilties for business logic and would generally be suited to defining process logic. A more complex SOA composite likely includes both components and others as well.
It is a good practice to create a Mediator in all Composites even if the Composite has a single BPEL Process. The Mediator will help take care of additional operations that could be added to this Service in future.
Anything that does not belong to a process has to be extracted out and put in the Mediator. For example, if the process needs the data in a certain format then that transformation can be done at the Mediator or the OSB but not in the BPEL.