Shelly has it right, the WCPP is more controlable, arcing ball. The Black Pearl is definately has the sharper backend. Both are great balls, and actually make a great 1-2 punch. The BP is the first out of my bag, but as the lanes dry out, it becomes a little unpredictable and I switch to the WCPP and I'm locked in for the duration. Very similar shots.
Edited on 1/28/2008 0:58 AM