also regarding price?!
Prices cannot be compared because they depend on the construction and execution.
One can generalize with "a flat roof is relatively the most expensive," but you can use thin or thick rafters for a shed roof, mono-pitched, or hip roof. Cheap and expensive wood. The builder usually doesn't understand that. He can rather say something about the visible tiles.
Theoretically yes, but nowadays I often see these roofs with a windowless "ridge end" (which seems completely ridiculous to me, especially if it's not a split level).
No one is talking about that, Thies. The fact is that one uses, among others, a staggered shed roof to bring light into the darkness.
This is about the topic "various roofs" and not about what can be done wrong with roofs.