Which head would give the best blood trail, the Stinger 4-blade or a 3-blade broadhead such as the Montec or new Snuffer SS? Thanks?

I don't see that it matters. Depends on where they were hit. The BH provides the cutting to promote the bleeding and death of the animal but sometimes most of the bleeding is internal. Cutting diameter gives you the maximum damage but doesn't guarantee a good blood trail.

these question are impossible to answear. It depends on you and your shot selection and shot placement. all heads are just as good as you are.

There are too many variables that have to beconsidered which would make this question very tough to answer. Blade sharpness, shot placement, amount of penetration, etc.... That said, I believe that all of the heads you have mentioned are quality heads.

Personally, I use the 150 grain stinger with my longbow.