Well obviously leatt feels their design is safer in the long run, if they didn't feel that way they could change the back design with a snap of their fingers and they would obviously make a lot of money from that because people would have to go buy a new leatt. If I had to choose, I would go for a bionic. But I heard you can't wear that with a chest pro... I dont see why not... If it doesn't fit you can just cut the plastic. But leatt gives me the most performance for my dollar. 200 dollars to save a broken neck is well worth it. Still if I had the money for a bionic I would get that.