I am remodeling my bathroom. I am trying to decide between a cast iron tub and steel tub. I know the pros and cons between the two as far as weight and heat retention and the fact that the enamel is thicker on the cast iron. The question I can't seam to get answered is the surface durability. Is the finish on the cast iron and steel the same process or is the actual surface of the cast iron more durable? Is one more scratch resistant than the other? I want the tub that will maintain the finish the longest. It will be used very little as a tub and more as a shower.