If you are going to replace your roof, use the same material it came with. It's proven, fairly inexpensive and easy to install. It will last along time. All of these products that are discussed do not meet all this criteria. The fact that even the high end $100,000++ coaches use the same product should indicate that it's good. At the prices they charge for the high end coaches if there was something better they would use it. The biggest problem with a roof isn't the material but the way it is sealed and maintained around the edges and openings on the roof. Stick with the proven product not some "Band Aid"..
B.O.