Some would say cast iron is a thing of the past. They might question why you would put in the work? Others would say the heavy-weight champion is like no other. The exalted metal of the bunch is definitely worth the work, in our humble (yet expert) opinion.
For optimal heat retention and impervious sturdiness you will want cast iron grills. Their density and fool-proof way of supplying even heat make them a thing of timeless (and lifetime-worthy) beauty.