Got a bunch of money? The best roof I can find is Hardy Board laid over real plywood. The Hardy board is glued down in addition to using corrosion-proof deck screws (pre-drilled or self tapping). Then each panel seam is laid with epoxy (with filler for any cracks) and fiberglass tape and lightly covered in a second application, like drywall or building a home kit boat. The entire surface is then primed in epoxy and fixed for any voids, penetrations like roof vents, and holidays - you decide how to finish and what color.
Such construction was tested in major hurricanes in the Bahamas in 2004 and 2005 and it performed better than any other kind of roof, wind speeds over 145 MPH for over 24 hours. The sandwich construction is very strong. No metal, clay tile, slate, or asphalt roofing system even comes close. It's just expensive as heck unless you can score darn near wholesale prices. -sammie