Bigbulls is right on. The four blade models cut more. All of his accurate math aside, it only makes sense. Four "knives" will cut more than 3 will, logically. The other issue being brought up is penetration. OK, I guess the fourth blade would cause MAYBE a tad more drag, but as sharp as those rascals are, it don't matter. Every deer I have shot with a 4 blade muzzy has zipped all the way through and stuck in the ground. Can't possibly get any more penetration than that.