W have a rolled seam metal roof and , because it looks so well with the Colonial nature of the farmhouse, wed found that we started a "run" on rolled seam roofs around our township where the high end roof is cut Peach Bottom SLate.
We hve severl 'telescope" additions to our place and the one room is a study with a huge walk-in fire place(like our kitchen fireplace), and the rain on the metl roof lulls one into sleep.
Complete with offset "snowbirds and blue glass globed lightning rods on the main roof and various additions, its a knockout . I would NOT spend for copper because the acid rain dissociates copper and makes a green like coating on stole or stucco.
We have so many fireplaces and woodstoves on this old house that Id be afraid of a shake roof. In the coldest part of winter we usually have 2 fireplaces roaring