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ROS logging uses approach 1. All log messages are passed to /rosout.

The first approach is simple to implement as well. You just need a single subscriber topic and each node has to publish to one topic making the debugging easy as well if there is an issue.

Approach 2 may take up more bandwidth. Each new topic will take up a certain amount of bandwidth which may not be ideal if you are also passing bandwidth heavy information such as pointclouds/images.