When comparing aluminum griddles to cast iron, the most significant differences lie in weight, heat retention, and maintenance. Aluminum griddles are lightweight and heat up quickly, making them easy to handle and ideal for fast cooking tasks. However, they do not retain heat as well as cast iron, which can lead to uneven cooking, especially when preparing thicker cuts of meat. Cast iron griddles, though heavier and slower to heat up, provide superior heat retention and even cooking, making them better suited for tasks that require consistent temperatures over extended periods. Additionally, cast iron's natural non-stick surface improves over time with seasoning, while aluminum griddles often require non-stick coatings that may wear off with use.