These are different types of cooking grates construction. All of them have their benefits. Cast iron cooking grates provide consistent and even heating throughout the cooking surface. The porcelain or ceramic coating on steel cooking grates makes them a lot easier to clean and rust-resistant.nnThe stainless steel cooking grates are among the best ones because these are heavy-duty long-lasting construction and delivers heat evenly throughout the cooking grates. You will find the best premium quality grills having stainless steel cooking grates. The cast-iron cooking grates are generally used in the cheap grill models.