Well actually the machete doesn't kill anyone.. if they have a Heavy Armor , Armor, Super Armor or Medic Armor they wont actually die and may need some hits ...
My favorite of the 4 would be the chainsaw :3
But seriously the wrench can save your ass in some situations
Stop relying on Pure damage , Seriously , it ain't really gonna be the Weapon you are Use to go around the map Murdering Terroists With , And Gives you a Large chance to get Caught with your pants down