The immortal starfarers necessarily go somewhere; the status game players don't necessarily go anywhere. Hence "winning".

Deciding that going somewhere is "winning" comes from your existing utility function. Another person could judge that the civilization with the most rich and complex social hierarchy "wins".

Rationality can help you search the space of actions, policies, and outcomes for those which produce the highest value for you. It cannot help you pass objective judgment on your values, or discover "better" ones.