I shoot 4 blade muzzy's because I get excellent flight with them. The 3 or 4 blade will work equally well.

The"drag" difference will be unnoticed in the two heads. Your shooting into an animal that is full of lubricating fluids not a foam target. The cutting surface is not enough to make a difference either. Also you do not have to line up three blade heads with the fletching...makes no difference what so ever.

Just shoot the ones that fly the best and put it in the right spot and everything will be fine.