the goliath is very condition specific----it needs oil and/or carrydown to perform at it's best. a straighter line also works best.
the punisher is for drier lanes---i need a lot of dry to get this ball to move. of course, the cover prep on mine partially dictates that( 4,000 abralon, rough buff, brunswick polish ).
the nemesis is a great medium condition ball. i've used it wetsanded 2,000 grit and i've used it sanded a little duller with some brunswick polish on it. i got a great roll with both depending upon the lane condition.
i really like the ambush best. it's a particle pearl but it's a low load particle and the rg is slightly higher than the other bvp's. it gets down the lane just fine and has a great roll.