The main difference between Weber grill models is their size, features, and cooking capabilities. Weber offers a wide range of grill models, from portable charcoal grills to large gas grills with multiple burners and advanced features such as built-in thermometers and side burners. Each model is designed to meet different cooking needs and preferences, and also comes in different price ranges, which can affect the quality of materials used in construction and the durability of the grill over time. Therefore, it is important to consider the size, features, and budget when choosing a Weber grill model.