Just like every other Nolan film it's really hard to say. Your pick is amazing.
Heck that whole segment of the film, the tension of them trying to warn Dr. Mann not to do what he did, and then the edge of your seat amazement of that entire docking segment is a sight to behold, but my heart belongs to the emotion of this film, and Cooper watching all those messages, and us finally seeing adult Murph and Matthew's absolutely excellent performance there was a sight to behold.
Docking by far, but I would start just before that....when Coop and Mann take a walk....Mann starts talking and the music starts to build then....we get shots of Murph and Earth intersped with Coop/Mann and the race to Endurance...the docking by Mann and then the docking by Coop - I'm sure that whole thing was probably 1/2 hour but just awesome stuff there....