It’s a question that is guaranteed to split a room full of football fans into at least five sections with angry shouts of ‘Jurgen Klopp’, ‘Pep Guardiola’, ‘Carlo Ancelotti’ and even some rogue hipster names bounded about the room. Just like naming the best male or female player in the business, it’s ultimately a subjective exercise and everything from transfer funds, dressing room morale, pure...