Several factors influence the performance of modified bitumen compared to rolled roofing in asphalt or bitumen modification systems. Key factors include the type of polymer used for modification (e.g., SBS or APP), the thickness and weight of the membrane, installation methods, and environmental conditions. Modified bitumen typically offers enhanced flexibility, UV resistance, and durability, while rolled roofing may be more cost-effective but less resilient. The choice depends on specific project requirements and performance expectations.