Hello. Welcome. I see this is your first post. Please take some time and swing over to Roll Call and introduce yourself so that we may give you a proper "Hello". All info you can provide us with such as smoker type, location and so on will help us answer any questions you may have, and pictures help a bunch. As for your question: As long as you give it a really good hot burn you should be fine using either as far as safety goes. The trick comes with building the smoker. I was a welder for a while. When you say iron I think of cast iron. No matter. Be it cast iron, steel, or stainless, each has it's own characteristics. Each also requires different techniques for cutting, welding/and or fixing together. If you have the knowledge to work all 3 then you should be fine no matter your meaning. Just FYI, you do know fine quality cast iron and case hardened steel will break if dropped on a hard surface? Breaks like glass. Good luck. Keep Smokin!
Danny
