There are a few things to consider when deciding whether cast iron or steel is better for your fire pit. One is how long you plan on using the fire pit. If you only plan on using it for a short period of time, then steel may be a better option because it will retain heat better. However, if you plan on using the fire pit for an extended period of time, then cast iron might be a better choice because it will not lose heat as quickly. Another thing to consider is how often you plan on using the fire pit. If you plan on using it frequently, then cast iron might be a better option because it is more durable and can withstand repeated use. Finally, consider the cost of each material. Cast iron is typically more expensive than steel, but it will last longer and is less likely to rust. Steel is less expensive but may not last as long. Ultimately, the decision of which material to use for your fire pit depends on your individual needs and preferences.