Building A Greenhouse What Are The Pros And Cons To Building A Flat Roof Instead Of A Triangle Roof On A Greenhouse?

What are the pros and cons to building a flat roof instead of a triangle roof on a greenhouse? - building a greenhouse

my friends, building a small greenhouse from our balcony and we thought it would be easier to build a greenhouse with a flat roof instead of a triangular roof, and some commercial buildings have flat roofs.

Is there a reason why each greenhouse has a roof, I saw the triangle?