Fiber reinforced plastics are frequently used due to their specific properties. However, their application requires machining processes such as milling. These materials are often used as an alternative to aluminum alloys. The novelty in this article are the comparative results of study on the milling of polymer composites and aluminum alloy in three cutting zones. According to the research presented in the article, it was determined that changing the milling parameters such as feed per tooth and cutting speed increases the maximum feed forces in each analyzed zone. The maximum values of 580 N were achieved for the aluminum alloy in the first zone at a cutting speed of 600 m/min. In the case of surface quality analysis, an increase in feed per tooth resulted in an increase in the Ra parameter in each zone, with the highest values occurring in the first zone. An increase in cutting speed resulted in a decrease in Ra values, with the lowest values of 0.40 μm being achieved in the last zone for aluminum alloy at a cutting speed of 600 m/min.