Do not choose a god according to their might. Might is vain, transient, and does not lead to rightness.
Nor should you choose them according to which of them seems most likely to exist. Simply existing is no assurance of goodness.
Rather, ask of your heart, “What is your unreasonable wish?”
Ask the same of the hearts of gods. When you find that god whose wish is your wish, then your hearts will be like one heart, and your mission will be one mission.
Serve none unless this is true.