You get to choose one superpower. Pick one of these, and explain your choice:
the ability to speak and understand any language
the ability to travel through time
the ability to make any two people agree with each other
And this is my response:
I would probably choose, the ability to make any two people agree with each other, if I can use this superpower on more than two people; but if not, then I would choose the ability to travel through time.
The ability to make people agree with each other could, if used for good, make a bigger difference overall in my opinion.
I imagine using this superpower somewhat like how The Eidelons (The Peacemakers) from Farscape used their ability, but I would probably use it in a way to make things better and more balanced overall.