Which is better, a metal or shingle roof? We have a shingle roof, but it needs replacing.
Our home is modular, with no attic.
Like many things, the answer depends on your budget, tastes, the neighborhood, etc...
With that said a decent quality metal roof properly installed will generally last longer, reflect more heat and not be damaged as easily as most shingle products. Just make sure that no matter which system you go with it is properly installed.
You may also consider looking into cool roofing materials which both roofing materials have. My blog post here has more detail.