Both of these bumper designs are very nice. Honestly, I'd be happy with either one myself. To me the new bolt on just looks quite a bit larger. Maybe there really only is a couple inch difference in clearances. Some people will not want to cut off their rear cross member too so the bolt on has advantages. I've seen Brocks bumper in person and was very impressed with fit and finish. I really liked the low profile look and the way it wraps under the truck and provides nice protection from mother earth too.