I don't know how much weight you want to put in my opinion, because I think the Rule is one of the best balls I've ever owned, and I thought the Ultimate Inferno was one of the most over-hyped, and worst balls I ever had, but sticking just with what I saw on the lanes, the Rule seems to have more hook, and more continuation on the backend, and through the pins. A lot of the difference I saw was power at the pins, the Ultimate always seemed to hit a little weak, due to not being strong enough to create good entry angle for me, whereas any carry trouble with the Rule seems to come when the lanes are a little too dry for it, and it burns up its energy a little too soon.