Money vs Horsepower
Speed costs, how fast do you want to go?
Using the cam card specs really doesn't describe the benefit of a roller cam. The two cams may have similar specs but the roller cam, once it begins to open the valve, opens it faster and holds it open at maximum or near maximum lift longer.
Here's a pic from Lunati's website that clearly shows the benefits of a roller cam. In my view, if your budget can afford a roller cam, you should run a roller cam. The benefits are significant.