Single Pattern vs Dual Pattern Camshaft

My understanding of the dual pattern cam, has to do with flow of the heads. Horse power depends on the flow of the intake ports, this can be hindered by an exhaust port that flows less than 75 percent of the intake. By adding more lift and duration to the exhaust can increase potential for horsepower. Depending on the goals of your build. That’s one explanation I’m sure there’s other reasons for a certain cam