In a fight between a Janitor and a Waiter, it's challenging to determine the outcome without knowing specific details about their individual skills, physical abilities, and training. Generally, both professions do not involve combat training as part of their job responsibilities.
However, if we were to imagine a fictional scenario, a Janitor might have a slightly higher advantage due to their exposure to various cleaning tools that could be used as improvised weapons. They may have experience handling mops, brooms, or other cleaning equipment, which could potentially be used for defense.
On the other hand, a Waiter might have better agility and coordination from constantly moving around in a restaurant environment. They could use their serving tray as a makeshift shield or possibly as a throwing weapon.