Have almost 30 yrs experience in residential construction/remodeling. And TGIF too.
A "true" standing seam roof is a good investment but very pricey. A "snap-lock" standing seam roof is a good choice if budget is an issue. An exposed fastener metal roof IMO belongs on a shed or barn, not a home. The "lifetime" warranties on some asphalt shingles aren't worth the paper their written on. I don'r have enough experience with the stone coated steel roof systems (can look like woodshakes or terra cotta tile) to speak on longevity, but they are a giant PITA to install.
Thanks. Our landlord just reroofed our house with a metal roof and the roofers were saying it was more expensive up front (around $10k in labor and materials I think the roofer said) but that it should reduce cooling costs by up to 15% and will last considerably longer than a regular asphalt shingle roof. Didn't know if that was true and something to remember for when we own a house again because I'm not against the look of a metal roof for certain styles of houses (I think Craftsman and Victorian styles look sharp with a metal roof that is installed correctly).
Not an exposed fastener I hope, UV degrades the washers on the screws and expansion/contraction with temp changes enlarges the screw holes.
Longevity, cooling costs, overall maintenance. I live in the Southeast and metal roofing seems to be the more popular choice in rural areas. Just wondering if metal roofs really do hold up longer and thus are more economical in the long run when compared to asphalt shingles.