Suiting her title, the Queen is the strongest of all role cards. Offering 7 base strength, which is the highest option. Choosing the Queen card will expand your influence. You can also place an additional worker in the city where you placed the other worker in the Action Phase!
Having majority in a given city is a great potential source of scores in Ahau. Although you need to be aware that the placement limit is relevant even in the Queen’s case: That extra worker helps in several ways; You’ll receive more resources from adjacent production sites if you wish to deplete them. The number of resources to take equals to the number of workers in the adjacent city.