Apologies for the highly controversial title, but I am sure any aficionados of science irrespective of disciplines would have found themselves at this ubiquitous crossroad at some point of their scientific career. For the fortunate ones, this might not have happened too frequently but for the ones who are constant worriers on how decisions can have a lifelong impact on themselves even beyond the scope of childhood ambitions, this dilemma seems evermore pertinent.
Perhaps, it might have been induced by the late nights spent camping out at the library whilst revising for the finals, or from another perspective, it might have been inspired by a talk from a senior or someone of a certain degree of expertise.