ORIGINAL: cherokee_outfitters
I've always preferred the weight for penetration especially for elk. But i'm new to the carbon world so I really can't say. I know a miss on a target that hits a rock pretty much has the same effect on the arrow, it's a dead soldier. Time will tell for me. I trully don't know but my ole alums were always on the money.
If you're concerned about weight for pentration purposes then look at the different arrows made by manufactuers these days. Not all carbon arrows are light. There are some put out by Gold Tip, Carbon Tech and others that are just as heavy as an aluminum. In this case you retain the kinetic energy and momentum you crave, but have a more durable arrow shaft at the same time.