Gable and valley is the most common because i live in the country, yes around in grand island there is different , because the weather is different throughout the day and so we need a multipurpose roof, which is good with heat and rain and hail and snow, It would depend on where i would build the house, but the house would be a gable and dormer, and because it's a common old house type and it works best here in Nebraska because of its weather, and the space usually given. its a nice but efficient roof.