Never found a problem with the three blades. Never used the 4 blades, but you need to consider the added surface area. I could see where the extra surface area "could" (probably not much) cause more planing and less penetration than the three blades. Id also say that it would probably not be enough to notice at normal bow ranges. Ive found no problem with the three blades. My favorite heads are; Muzzy three blades, slick tricks, and Monotec G5s. All great heads. Ive never had a single problem with any of the above.