[Double_Cast]

Suppose you're playing a videogame. Your character just leveled up. You can upgrade either Attack or HP.

* "Upgrade Attack" is more efficient. It allows you to beat the game faster. But since your HP is low, you can't afford to make mistakes (get hit).

* "Upgrade HP" is more robust. It increases your damage-buffer, which allows you to absorb more mistakes without dying. But if you make zero mistakes, you won't beat the game as quickly as if you'd upgraded Attack.

IRL the dichotomy is often "income vs wealth", "velocity vs displacement", "throughput vs latency", "strength vs endurance", etc.