Are certain professions prefered by Allah?

If the main purpose of life is to worship Allah why should you choose a secular profession like being a lawyer. Why shouldn't you become a nurse, doctor, biologist, a teacher or an Imam instead? Those are all professions where you can directly execute the tasks Allah loves and you even paid get for it. As a nurse you take care of sick or elderly people and as a doctor you cure sick people. What could there be anything better you could do for your deen? As a biologist you learn about the creation of Allah. As a teacher you teach people which is highly respected in Islam.