If they are drilled identical, the Vapor will want to go longer down the lane with a more defined backend reaction.  The Strike Zone typically wants to read the lane quicker with more overall hook and a smoother, but continuous backend reaction.  Lane conditions will be similar to use each ball.  It just depends on the look you want and what is working best.  Hope this helps.
--------------------
Steven Vance
Former Pro Shop Operator

If anyone out there is worried about the scores being too high, try duckpin!!