Mortgage brokers offer all types of mortgage rates, although they may choose to compete in certain categories. For instance, a broker may focus on offering a low 5-year fixed mortgage rate at the expense of a higher 5-year variable rate. Deciding on what type of rate interests you will guide you to the most competitive broker in your desired category. If you like the stability of fixed payments, you may choose to go with Broker A, while Broker B may offer a lower variable rate for individuals who are open to interest rate fluctuations.