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Hi there,
the difference is that the openni_launch driver works with alot of small nodelets and the openni_camera driver with a couple of nodes. You can see the difference when you using the rxgraph tool.
It seems that the openni_launch driver causes less network traffic but it seems that the driver is not compatible with some other packages. For example the ARtoolkit. (ar_bounding_box doesnt start for me)
regards ronny