Since granite countertops are man-made, there is more possibility that it will experience chipping and distorting over the long run. Since man-made materials will in general be heavier, this can frequently invalidate the extra expense of granite countertops.
By and by, the heavier the materials, the more probable it is that it will have more issues with listing after some time. You can keep this from occurring with granite by picking a more slender ledge material.