I would say it depends on several factors, if you are wanting to do a back to original restoration then steel is your only option. If you are handy with a welder etc and your tub needs panel replacement then you need to investigate it and value your time and cost of materials to either fix it or move on to a new tub. You now have the option of a reproduction steel tub as well as the fiberglass tubs. If I was making a year round trail capable rig I would go fiberglass if I need a new tub, if I was going show (like I am) daily driver type then I would go steel but both work well except in a true factory original restoration. I can tell you most people will be quicker to pick up fiberglass repair than they would to be come a good welder, it is simply an easier product to work with, does not require expensive tools etc. This is my opinion of things but hopefully it will help you decide for yourself. The Bronco Design tubs are outstanding quality, I have seen several of them and am very impressed with them.