If you do not have any rocks the crome is the way to go, they do last 2x, but are so hard they are a bit brittle and will crack and break sooner than a black bar. If you have rocks, put in the black set, they will take an impact and bend rather than crack. Then you can just press them back into shape. Most guys who have the crome bars and rocks in my area never get the extra life out of the bars due to rock damage.