The sharpest broad head straight out of the pack will be the Nap thunderhead. While both the others are fine broad heads the Thunderhead will have an edge in quality. The Muzzy will have a slight edge in durability. The Magnus Stinger will have a slight edge in penetration, due to it's design.
I like the fact that both the Muzzy and the Thunderhead can be re-sharpened by the use of a crock stick, with out removing the blade from the head. You can even leave it on the arrow and slide the head down the ceramic stick and then rotate, slide again, rotate and keep doing it until the blades are shaving sharp again. You can test it for sharpness by trying to slide the blade down your thumb nail and if it tries to dig in instead of slide, it's razor sharp.
You can re sharpen the Magnus Stinger, but you have to have the skills to do so.. And the head is not quite as durable as the other two.
Though I have killed deer with all 3 heads, and all three did well, I would go with the Thunderhead out of those three.
But If I had to say which head is the best on the market at the present time, I would have to say it would be the Slick Trick, due to hits great flight characteristics, and it's sheer toughness. The downside to the Slick Trick is it will cost twice as much as the others and is hard to re-sharpen.
