The purpose of this paper is to present a performance comparison of expert systems with production rules, based on classical binary logic and fuzzy logic, for feedback control of dynamic systems. The expert system based on binary logic, called ES-PR-BL, was developed in Prolog language, and the system based on fuzzy logic, called ES-PR-FL, was implemented using a Mamdani type inference process. The work presents simulation results for three types of dynamic system: level control in a tank, control of the angular velocity of a DC motor, and control of the linear velocity of a vehicle. The results demonstrate the specificities of each technique and could be used to guide the development of new hybrid control methods, with the aim of improving efficiency in the control of dynamic processes employing expert systems based on production rules. The findings were highly satisfactory and demonstrated the specificities and applicabilities of the two expert systems studied.