tburky,
I have my Hy-Wire drilled with 4x4x3.5, and my Sky Rocket drilled 5x5x2.5. With the different layouts, on our house condition, both balls cover about the same boards, but the Hy-Wire shapes with a bit more hook roll through the backend as it revs up faster for me, compared to the Sky Rocket that is more rounded and revs up later.