honestly I don't think you can go wrong with either head. Up until this season I was using Hellrazors, now using Bloodrunners. Slithered thru my NY buck that he had no clue what happened to him and was in awe and motionless and didn't go more than 15 yds & very slow till he tipped over from the blood loss. The doe he was with stood yds from him and kept staring at him like whats wrong.
Now my old coworker is shooting the Nightmares and just shot a proghorn in Wyoming and another just in Colorado. His are shooting dots at 60yds. Now I don't shoot that far, I only have 1 pin for 25yds but I have yet to shoot over 18yds max so far.
I'm more impressed with the Bloodrunners and their flight and accuracy that I am using them.