Perhaps most important is that spray foam insulation is highly durable. When you go with insulation, you want to ensure that whatever you choose will last for a long time to come. Traditional insulation can lose its effectiveness as time progresses.
Spray foam insulation, on the other hand, should hold up for decades because of its chemical composition. It uses isocyanate and polyurethane, which expand and then harden. There is no worry about the foam losing shape, sagging, or shifting over time no matter what kind of temperatures it faces. You simply get durable insulation that will provide reliable coverage no matter what for decades to come. That is the kind of reliability you deserve.