Super 91
Lil-Rokslider
I think some of the best blood trails have been either the Magus Stinger Buzzcuts or G5 Strikers. I've shot a bunch of animals with Strickland Helix 2 blade heads, and I've never lost an animal, but sometimes you get nearly zero blood depending on how the head went through the animal. My preferred head overall is the Buzzcuts, they just work.