There are three basic styles of broadhead, 2 blade, 3 blade, and 4 blade. All have been used with success over many years, but each has different characteristics. Lets start off with discussing the two blade broadhead. The two blade is very popular among traditional archers because it provides excellent penetration, often complete pass throughs. This means that when a large game animal is hit the two blade broad head will often allow the arrow to pass completely through the animal. Two blade heads are also very easy to sharpen and re-sharpen, so they will last many years if taken proper care of. Personally I prefer the two blade broadhead.
The three blade broadhead is also quite popular. It allows for massive holes, making quick recovers on game animals. However, the three blade is often much harder to sharpen than the two blade, and can take some getting used to. Three blade broadheads fly very well, often very similar to a field point (practice point).
The four blade broadhead is used quite often as well. It also will leave large wounds and makes recoveries easier. However sometimes the bleeder blade (small blade that makes it a four blade head) can snag bone when it enters the animal making very little penetration. When using a four blade broadhead or any hunting head for that matter make sure you are producing good ethical shots on game animals. We must become proficient with our equipment so that we can produce quick, clean, humane kills. Please respect nature, other hunters/forrest users, and wildlife when hunting. Good Luck!