How is Elie more courageous than his father, Shlomo, in the memoir Night?

Both Elie and Shlomo Wiesel endured a multitude of unspeakable horrors, and comparing one person's courage to that of another within the framework of the Holocaust seems a bit unfair. I will list a few examples below in which Elie demonstrates courage, as well as a few examples in which Shlomo demonstrates courage, and this should be of aid as you undertake the task of comparing the two men.
Examples in which Elie demonstrates courage:
Chooses to undertake death march from Buna to Gleiwitz with an injured foot
Risks his life to sneak his father onto the right train (toward safety) in Gleiwitz
Protects his father's food rations when Shlomo is dying of dysentery
Survives the Holocaust and writes a memoir of his painful story
Examples in which Shlomo demonstrates courage:
Instructs his son in survival and offers encouraging sentiments
Gives his knife and spoon (the only family property) to Elie when he is chosen for the death group in Buna
Endures brutal death march from Buna to Gleiwitz in a weak state
Endures beatings by Nazi officers and by fellow prisoners