I used thunder heads for about 18 years and it is one great head, then my buddy turned me on to Wasp jackhammers andbetween me and him we have about 8 kills and none of the deer have gone over 80 yards and most dye with in sight. They leave the biggest blood trails i have ever seen. As some of the guys have stated above all of the heads will work great if you hit them where you are suppose to but its when youmake that dreaded mistake and hit them poor that i want that big cutting radias and lots of blood. Just my 2 cents Walt