Start of an Adventure with an S & S 8SC

Whats a good choice for replacing the roof? It has the look of aluminum but not positive on that but over the overhang portion I do see a low spot which is sort of in an unusual spot as the seam where the front nose meets the roof material is about 10" further forward. I was looking around and found roof replacement kits on RVpartsnation.com and they have a rubber kit or a superflex kit.

Both seem like decent options and pricing is comparable for the 15' I need