Aluminum is lightweight and, like copper, is a good heat conductor. Look for heavy gauge, anodized aluminum, which is less likely to warp and resists stains and scratches. Aluminum is especially good for cake pans and cookie sheets. Stainless steel is extremely durable and resistant to stains, scratches, tarnish and corrosion. But it doesn't conduct heat as well as other metals, so it is best combined with other materials, such as copper.
Cast iron is great for browning and broiling.
Though it heats slowly, it retains heat for a long time. It also requires more care than stainless steel or aluminum and may rust if it is not carefully dried after washing. Porcelain enamel cookware is available in a wide range of aesthetically pleasing colors. The enamel, which is applied as a coating to aluminum, stainless steel or cast iron is dishwasher-safe and stain resistant. Nonstick cookware is great for health-conscious couples who want to cook without a lot of fat or oil.