What are the main differences between a cast iron and steel bathtub in terms of durability, maintenance, and cost?

Cast iron bathtubs are known for their durability and longevity, as they are resistant to scratches and dents. They require minimal maintenance and are easy to clean. However, they are heavier and more expensive than steel bathtubs. Steel bathtubs are lighter and more affordable, but they are not as durable and may require more maintenance to prevent rust and scratches.