Any of them will work if you hit the vitals. That's what matters. Some mechanicals are better than others at penetration if you're off target and hit bone. Not exactly sure where the BR fits in there, but just looking at them, it seems to me that the fat ferule (center part where the blades are connected) would decrease your penetration. I've thought about using them, but would only use them (like any broadhead really LOL) when I knew I had a really good shot.