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What is better – single or hip roof for a bungalow?

I would like to build a bungalow on my property.

I am pondering on the shape of the roof.

A single pitched roof is nothing like a flat roof, but with a slightly sloped roof to allow water to drain better.

In the past, there were almost always problems with flat roofs and their leaks after a few years. How does today's single-pitch roof design differ from a hip roof? Is a hip roof always safer than a single-pitch roof in terms of leaks after 20 or 30 years? Or have mono-pitch roofs become so watertight that they no longer have any disadvantages compared to hipped roofs? 

• hip roof
• single roof