Well, it's like this. Mechanicals do have the ability to penetrate. They can completely pass through. But they also have the ability to fail, not open at all, or open badly causing a small wound channel. They also have the possibility of plaining or kicking off of an animal, if the shot is a somewhat sharpe quartering away shot, and one of the blades hits the animal at the right angle and that one blade opens first and throws the Broadhead away from the animal.

Now, with that said, there are tons of animals killed with mechanical broadheads every year. Some work better than others, some work really well. But, my preference is a fixed blade. They work everytime, sorta. A fixed blade can brake a blade, It can also plane off of the animal at times, though it is much lessof an occurrancethan with the mechanicals.

So all I can give you is my opinion....Fixed blade everytime. I do not have a mechanical head in my posission today. All I own is fixed.