Razor Blade go the Razor Blade, i got my drilled on fri, spent some time with the ball, 2day i figured out how to bowl good, got it drilled 3'' (leverage pattern i think ) away from the pin i think it is, bowling it down 5 board gets awesome backend reaction, but now i bowl throught 15-20 and then shoots out to 5-10 and then hooks in massive, bowling on a med oil conodition, and i basicly just have to support the ball off my hands and then let the ball do the work 4 me. i have also got a switch blade but not drilled up yet. there r only 2 differences between them, 1. the Razor Blade has Hammer's new Cut Thoart Cover stock while the switch blade has a reactive cover stock, 2. the finishs r different, Razors a sanded finish while the switch is a polish. so bowling back up wouldnt b much of a problem i think, but if u think the razor hooks to much 4 ya, go the switch or a groove i still bowl with my groove spare ball really except the 10 pin and i have an 150 ave if u want to know