Both are PFAS-free kitchen staples, but they cook very differently. Here is an honest comparison to help you decide which belongs in your kitchen.
Two Great Materials, Different Strengths
Stainless steel and cast iron are both excellent, chemical-free cookware materials that will last a lifetime with proper care. But they cook differently, maintain differently, and suit different cooking styles. There is no single 'best' — the right choice depends on what you cook, how you cook, and how much maintenance you are willing to do. Many serious home cooks own both.
Heat Distribution and Retention
Cast iron is famous for heat retention — once hot, it stays hot. This makes it excellent for searing steaks, baking cornbread, and slow cooking. However, cast iron heats unevenly: the area directly over the burner gets significantly hotter than the edges, creating hot spots. Stainless steel with a multi-ply base (like SEIDO's ThermoCore 5-ply) heats more evenly across the cooking surface. It does not retain heat as long as cast iron, but it responds faster to temperature changes — useful for sauces, eggs, and dishes that require precise heat control.
Weight and Handling
A 28cm cast iron skillet weighs approximately 3.5-4.5 kg. A comparable stainless steel pan weighs 1.2-1.8 kg. This difference matters more than many people expect. Cast iron requires two-handed lifting, makes tossing or flipping difficult, and can cause wrist fatigue during longer cooking sessions. Stainless steel pans are light enough for one-handed use, easy to toss, and comfortable to manoeuvre. If you cook frequently or have any wrist or grip concerns, the weight difference is significant.
Maintenance and Seasoning
Cast iron requires seasoning — building up layers of polymerised oil that create a natural non-stick surface. New cast iron needs initial seasoning (multiple oil-and-bake cycles), and the surface must be maintained by avoiding soap, drying immediately after washing, and re-oiling after each use. If the seasoning is damaged, food will stick and the pan may rust. Stainless steel requires no seasoning. Wash with soap and water, put it in the dishwasher, use metal utensils — it does not matter. The cooking surface is always the same. This makes stainless steel significantly easier to maintain.
Reactivity with Food
Cast iron is reactive with acidic foods. Cooking tomato sauce, wine-based sauces, or citrus dishes in cast iron can strip seasoning, impart a metallic taste, and cause the pan to leach iron into food. Short contact (deglazing) is usually fine, but simmering acidic foods for extended periods is not recommended. Stainless steel is non-reactive. You can cook anything in it — tomato sauces, wine reductions, lemon-based dishes — without affecting flavour, seasoning, or the pan itself. This makes stainless steel the more versatile option for varied cooking.
Compatibility
Both materials work on gas and electric hobs. For induction, cast iron works natively due to its ferromagnetic properties. Stainless steel works on induction only if it has a magnetic base layer — SEIDO pans include this in their 5-ply construction. Both are oven-safe, though cast iron handles get extremely hot. Both are suitable for outdoor cooking on grills or campfires. The key compatibility difference is the dishwasher: stainless steel is fully dishwasher safe, while cast iron should never go in the dishwasher.
The Verdict
If you want a single, do-everything pan for daily cooking, stainless steel is the better choice. It is lighter, easier to maintain, non-reactive, and more responsive to temperature changes. If you want a speciality pan for high-heat searing, baking, or campfire cooking, cast iron is excellent. The ideal kitchen has both: a stainless steel pan for everyday cooking and a cast iron skillet for weekend steaks and baked dishes. Start with stainless steel if you are building a collection from scratch.
