This is the great dinner-table debate of world trekking, and it is really a choice between two opposite prizes. Kilimanjaro gives you a summit of your own: the highest point in Africa, under your boots, earned. Everest Base Camp gives you an audience with the king: a two-week walk through the greatest mountain range on earth to stand at the foot of the highest mountain of all.

Before any numbers, one honest thing needs saying. On some climbs, tips are not a thank-you, they are the wage. Crews on cut-price expeditions can depend on tips to reach a living income, which quietly turns your gratitude into the payroll and puts the welfare of the crew on your conscience instead of the operator's books.