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If each node will be accessed and configured separately at runtime, I recommend option 1: dynamic_reconfigure.

Advantages:

reasonably nice GUI with minimal implementation effort
efficient updates
clean separation between nodes, making them easy to reuse

Disadvantage:

not easy to access another node's current configuration

If each node will be accessed and configured separately at runtime, I recommend option 1: dynamic_reconfigure.

Advantages:

reasonably nice GUI with minimal implementation effort
efficient updates
clean separation between nodes, making them easy to reuse

Disadvantage:

not easy to access another node's current configuration

EDIT: I did some experiments. Dynamic reconfigure does update the parameter server whenever changes are made. So, reading the current settings is simple: just get them from the parameter server using the usual ROS parameter APIs.