As you bounce back and forth between them, you begin to learn how they are connected. What is the connection? If you and your party can save only one, which one would it be and why?
It is not clear from the given information which dimensions the adventurers are trapped in or what the connection between them is. Without more context, it is impossible to provide a meaningful response to the prompt.
However, if the adventurers were faced with the decision of which dimension to save, they would likely consider the unique features and inhabitants of each dimension, as well as the potential consequences of saving one over the other. They might also consider their own personal values and priorities, as well as the resources and abilities available to them. Ultimately, the decision of which dimension to save would depend on the specific details of the situation and the values and goals of the adventurers.