From experience few knows what they are about to get into when types of roof, there are basic questions you should ask to determine the choice of roof. Is it durable/longlasting? is it easy to install? How well can it resist rainfall and other weather conditions? Is the finished product pleasing? Etc
From a personal opinion and from experience steptiles/longspan aluminum has more advantages over stone chipsfor the following reasons-
(1)Steptiles/longspan aluminium are cheaper to stone chips
(2)Obviously stone chps looks more pleasing aesthetically but steptiles/longspan also comes in varying shades which adds to its beauty
(3)The weight of steptiles/longspan is lighter to stone chips
(4)Steptiles/longspan as the name suggests comes in longspan and is easily cover large area of roof , therefore it reduces numbers of wooden /carpentary materials needed to support the roof unlike the stone chips.
(5) They are easier to maintain , repairing stone chips can be complicating
(6)Leakages are rare and easily curtailed with steptiles longspan aluminium , you may run into problems with stone chips if not well handled
(7)Steptiles longspan aluminium can be done by most roofers in town , stone chips requires special care, most often the company you bought the stone chips from will always advise they install
(8)For steptiles longspan aluminium time of assembling and dismantling is very short compares to stone chips
(9)They are both durable, but probability of leakages is higher with stone chips.