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As you describe it 1. and 2. are two different things.

uses ROS to (continuously) transfer information between nodes.
uses a getter, which means that B will need to have an instance of A from somewhere (i.e. they can't be in different nodes). The ROS equivalent of this will be to use a service call that B can use to get specific information from A.

Which one you need depends on the use case. If it is a lot of data and you only need part of the data in specific situations a service seems good.

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