It has been my experience that I get my best bloodtrails when I get a passthru. For ya'll that shoot 55+ lbs., penetration is not going to be much of a problem on deer with any decent broadhead. For folk like me that shoot around 45 lbs., you have to be more careful with your selection. Lots of people here seem to think that how sharp your broadhead is and what it hits is more important than the number of blades. As for me, a 2 blade gives me more consistant passthrus than any other. I would use the one that shoots the best (for your set-up) that I could get the sharpest.