I have always used fixed head, mostly muzzys now, and last year shot one with a ram cat. With the muzzys, I have always had a pass thru even when hitting shoulder bones. I do not get those extreme blood trails, but if you hit them right, you should find them. I shoot each arrow and hand sharpen each head, and spin test. I can usually reuse my broad heads after a kill, just resharpen and spin to make sure they are not bent. I hear of some great blood trails with mechanicals, but have helped track some shot with mechanicals and saw a normal blood trail. I guess either will work on the perfect shot, but when something is not quite right, like a bone gets in the path of the broadhead I think I would rather have a good fixed head. If I knew every shot would be a perfect behind the shoulder shot, I would give those wide cutting mechanicals a try. Different skill levels can also be a big factor. There are guys out there that will take almost any shot, no matter how the deer is standing.