Is the baking tray and baking tray aluminum alloy or enamel better?

If you take too many elements in your body, you will die. But some elements have great influence, and there is little difference between aluminum and iron.

For stainless steel, the precipitation of Cr NI Mn at high temperature is considered to be an avant-garde research internationally, and it has not been applied in practice.

If it's an oven, I recommend stainless steel, which has a smooth surface and is not easy to be contaminated by bacteria. It's better than iron. The melting point is higher than that of aluminum.