Only if you plan on having a large arsenal.  There is some difference but for majority of bowlers imo the answer is no to having both unless you tend to bowl often on heavier oil and prefer pearls.  Haven't thrown Gauntlet Fury but Scandal Pearl is alright.  Doesn't match up well with my style but its not a bad ball.  Wish I would have drilled it pin down.  I would say if looking for an angular strong pearl the Fury is the better bet as it will backend harder.