There is way too much variation in how much penetration you get and shot placement/angle to predict how much blood there will be to follow using a particular head. Of course big cuts will sever more tissue, but that isn't the whole story at all. I've had great blood trails with small fixed-blades and large expandables. But I've also had the opposite. In short, I believe the amount of blood that leaves the cavity isn't dependent on the head as much as how and where the shot enters and/or exits. And I'm not talking good/bad shots, simply angles and the tissues that were shot through.
All in all I'd say I have sub-par blood trails 40% of the time, good 40% of the time, none 10% and grisly Manson-like scenes 10%. My advice is that broadhead selection should be a balance between one that will penetrate as far as possible on a reasonable shot (taking into account species and equipment) and accuracy/forgiveness in the field. Considering the amount of blood trail a broadhead might produce doesn't even factor into my decision.
All in all I'd say I have sub-par blood trails 40% of the time, good 40% of the time, none 10% and grisly Manson-like scenes 10%. My advice is that broadhead selection should be a balance between one that will penetrate as far as possible on a reasonable shot (taking into account species and equipment) and accuracy/forgiveness in the field. Considering the amount of blood trail a broadhead might produce doesn't even factor into my decision.