The ultimate question for roofing is: “What is the best roof?” The accountants will tell you that the answer is simple: It is the roof that costs the least over its life. It really does not matter what material is used or how the roof is attached; the answer is the same. If the roof fails, then the cost of a new roof is added to the cost.
When most owners look at roofing, they look at the materials and the systems, and the only part of the cost they consider is the initial cost. But the cost to install a roof is only a portion of the total cost of owning a roof.