Bigpun---Thats the question that has launched a million fistfights. Neither is cheap. In my opinion, if done properly, they are about equal in quality. Since it is almost impossible to find a straight, usable steel body now, fiberglass is sometimes the only option. If you rebuild an old steel body, you will need welding equipment and welding skills, however if you are doing a "total build", you are going to need those anyway, regardless of what material you use. I have built cars from both, and have spent hundreds (if not thousands) of hours welding and straightning old steel bodies. If you want a hotrod, and want it NOW, then glass is the way to go. If you are way richer than I am, you can call Brookville Roadster and buy a brand new steel body. .