Why use Bank Line over paracord?
Bank Line is designed to take a knot. Paracord will come undone because it is made not to knot, as its primary use is suspension from parachutes.
Bank Line is highly resistant to UV damage. Over time paracord will become sun bleached and fragile, Bank Line will not.
Bank Line is highly abrasion resistant. Over time paracord will wear through, especially if exposed to moisture and UV. Bank Line will not due to its braided construction.
Bank Line is highly water resistant, and therefore mildew resistant. Due to the tarred coating, water cannot penetrate the fibres of the Bank Line. Paracord will retain water and over time, especially in a wet & warm environment like a jungle, it will develop mildew which will compromise its strength.
Bank Line is roughly twice as strong as paracord. When you compare the tensile strength of Bank Line and paracord of the same thickness, Bank Line has a significant advantage.