Definitely "Lucy" for me
ANY of these missions would be scientific wins in one way or another, but I'd like to know more about the asteroid belt. The Jupiter Trojans are possibly less chaotic in their movement and interaction with each other, thereby making them safer to study. One presumes at least some (if not all) of the Jupiter Trojans are likely asteroid belt objects pulled into Jupiter's orbit by the passing mass of our largest planet. Perhaps, in addition to clues about our system's history, studying these Trojans will show us some heretofore undiscovered or misunderstood effect of gravity and system dynamics. THAT could be extremely useful knowledge if/when we finally get out and about in the neighborhood.