We have both a hoop and a gable building  The hoop is 36 wide with 10' side walls (5 foot solid and 5 foot with curtain.  The gable building is 50' wide with 14' side walls ( bottom 5 foot solid 5 foot with curtain and top 4 foot always open.  Both buildings are 26' high in the center.  The airflow in the gable building is much better while providing equal winter protection.  Price is about the same.  Monoslope would be somewhat better in the winter for available sunlight at the back of the building, but the cost was much higher.