Several factors influence the choice between rolled roofing and modified bitumen in asphalt or bitumen modification systems. Key considerations include durability, installation method, and weather resistance. Rolled roofing is typically easier and quicker to install but may have a shorter lifespan. In contrast, modified bitumen offers enhanced flexibility and resistance to UV rays and temperature fluctuations, making it suitable for more demanding environments. Cost, maintenance requirements, and local building codes also play significant roles in the decision-making process.