I have the Rival, Black Pearl, Sure Strike, Buzz. Have also used the BigR-Bang, Terminator and Hornet. Out of the list only the BigR-Bang was close to the Rival for reaction. From what I have read the Sting might be a close match? Out of all the LM balls I have I prefer the Black Pearl, this ball will rev up, set up and be as predictable as any ball I have ever used. The Rival is great if the back ends are clean and there is plenty of oil in the heads. One thing I have found that the LM balls will last longer and absorb less oil than the typical high end balls. I recommend the Black Pearl and compliment it with the Sure Strike and/or Buzz. The SS and Buzz hit as hard but get down the lane a bit more.