Would you rather be MacArthur's second-in-command or command the German Navy in the Second World War?
Short answerServing under MacArthur is the preferred choice: his deputy could take over a capable force, whereas the German Navy would still be profoundly unbalanced.
NotesBoth choices are treated as difficult, but serving as MacArthur's deputy leaves a way to take effective command. The joke is to give him food poisoning and take over while he is incapacitated. His deputy would then have a capable force to direct. A command role in the German Navy offers no comparable solution because the force itself is profoundly out of balance. Sidelining a commander cannot remove that structural weakness.