Route node and Service Call out in OSB

In OSB for a composite Proxy service (PS) that has to call 3 external services in sequence- we make service call out for 1st and 2nd external services and for invoking the last external service we can use route node.
Here technically PS is making web service calls to all the three external services. For the first two OSB uses service call outs and for the last one, route node is used.
What is the difference in service callout and route node in invoking an external service?
If route node is better in any ways why can't OSB come with route node type message flow action for all external service calls?
Thanks

HI there,
I have the same scenario as yours, I have to call 3 external services using Service Callouts and i have no idea how to use service callouts, how to and what to configure in SOAP body OR Payload parameters.
I have to call one service and then the response of the 1st service , i have to pass it as a request to the 2nd service, so on.
Can u please share with me how i can do it and what will be the best approach for that.
Thanks and Regards
Piyush Kapoor

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