I use thunderheads, they are an excellent head I have no reason to change.

As far as trails go, anything I can walk and just look forward without bending over and see blood is a great trail. Obviously one doesn't need a trail like that to end up with a dead deer, it just makes it nicer.
This past year I shot a doe that gave me the best blood I've ever had. It was one continuous spray, as she was bleeding out both holes, and her mouth. It was on the ground, up on leaves, everywhere.