During the moon landing, when Neil took over the descent from the failed computer, Aldrin's heart rate went through the roof. Armstrong's remained steady.
NASA picked exactly the right man for the job.
It's not really fair comparison. Being the actor is very different than being an observer.
Landing the LEM required the full active cooperation of both.
Amrstrong’s heart rate spiked to >150bpm during the moon landing, more than double his resting heart rate