The advantages of stainless steel are clean, easy to clean and non-corrosive. Because it is stamped from thin stainless steel, it is lighter in weight. The disadvantage is that heat transfer/heat absorption/and heat preservation are worse than pig iron. If it is used at home, it is undoubtedly advantageous from the point of view of convenience/portability/beauty/cleanliness/safety.

The advantage of pig iron is fast/uniform/durable heat transfer. Disadvantages are heavy/easy to rust/difficult to clean. Chefs in restaurants/restaurants/restaurants prefer to use it.

Conclusion: Each has his own merits, each takes what he needs and makes the best use of it. The advantages and disadvantages of everything in this world are relative.