alot of folks will claim better penetration with fixed blades which may hold truth according to that individuals setup. My personal experience, ive shot both fixed and mechanical... I personally prefer to shoot my RAGE and i will add that last year with my Mathews MR5 at 70lbs with my rage Broadheads i took a 22 yard shot on a adult doe slightly quartering away i blew through the ribs in and shoulder out with no prob, it hit the dirt behind instantly and still stuck in the ground almost halfway. The shoulder was all busted up and the blades still intact. Even i was surprised lol... i get clean pass throughs almost everytime except for one the arrow hit the off shoulder with my Switchback XT and just stopped... in any event i love the Rage BH as they are not an over the top mechanical head and opens up and opens the deer up instantly! i never had an issue with them and ive taken alot of deer with them.