You can ask this question to a hundred different people and probably get a hundred different answers. When I started bowhunting I used mechanicals because I started with an old old bow, they were the only broadheads that I could get to fly reasonably well. Now that I've upgraded, if you tune your bow right you're going to get any decently made braodhead to fly like field tips out of your set-up. I think we as hunters blame broadhead a lot of times when the real probably is a set-up/tuning problem. As for blood trails, you can shoot ten deer with the same set-up in the same spot and have ten different blood trails. You're going to win some, your going to lose some no matter what equipmentyou have.