Lars,
You are not going to notice a difference between a biolite and a DNA. I was riding a 03 premier with 03 parks, the entire setup weighed a little over 14 pounds. A DNA is only 1 pound lighter. As far as a Biolite being more durable, they can break just as easily as a DNA, here is a pic of mine, snapped right in half on a TS front roll.