If an octagonal roof is too big for your garden or preference, then the hexagonal roof can offer a similar style with less sides. Still retaining the unique and attractive design, this can be further enhanced with a finial on the top centre. Like other more traditional roofing types, the hexagonal keeps the sloping feature which allows water to rolls off.
With water unable to be left standing, the durability of your shed/gazebo is improved as the risk of damage and rot is reduced. Maintenance and treatment are the most important factors to maximising the lifespan of your garden's buildings and keeping them in pristine condition.