Academic careers between the completion of a PhD and the acquisition of tenure are characterized by short term contracts, high levels of competition, and uncertainty about the future. Existing research indicates that this uncertainty is one of the main causes for postdocs of all fields to constantly question the continuation of their career. Despite this commonality between the fields, we argue that the problem-constructions, coping mechanisms and ultimately the decision-making practices to exit or remain in science differ from field to field. Drawing on 60 qualitative interviews with physicists and historians, we compared imaginations of the job market inside and outside of academia, as well as narratives about how they perceive their agency to exit or remain. Our data shows that the imaginations of the job market outside of academia, despite ‘only’ being imaginary, have real consequences for their sense of precarity and planning of career paths. We propose that the uniform concept of future uncertainty must be separated into ‘existential uncertainty’ and ‘secured uncertainty’, which changes the very questions postdocs are asking when it comes to deciding whether to stay or leave. Physicists base their decisions on the question of ‘do I want to stay?’ whereas historians wonder if ‘I am able to stay?’, resulting in different coping practices. While those who consider their uncertainty to be existential see ‘survival’ as their only option or start a parallel career, those who perceive their uncertainty as secured rely on their ability to decide or postpone the question altogether.