Which are best, steel or cast iron stoves?

There isn't really a difference in heat output between a steel stove and a cast iron stove, just how it gives heat out - a cast iron stove will give out heat for longer after the fire has died down, although it will take longer to heat up.

A good cast iron is generally more expensive to buy, but can be more decorative as each panel is cast separately. This also means any damaged panels can be replaced in the future (although it is usually a big job involving rebuilding much of the stove).

If you are looking for an enamel finish on your stove, this can only be achieved on a cast iron stove.