Fallout 4 Best Melee Weapon
General Chao’s Revenge
General Chao's Revenge bears the Troubleshooter's effect, which does an additional 50% damage to robotic enemies. It comes with a serrated blade modification already attached.
Grognak’s Axe
Hits from this weapon cause more stagger and targets take bleed damage. It also has a hidden effect of less AP cost in V.A.T.S. (standard medium speed weapon, e.g. a Chinese officer sword, gets ~3 swings at 7 Agility, Grognak's gets roughly twice that).
Super Sledge
The super sledge is a high-tech sledgehammer manufactured of high-strength, ultra-light, ultra-dense materials and also includes a kinetic energy storage device to increase knockback.
Deathclaw Gauntlet
The deathclaw gauntlet appears as a set of severed finger-bones from a deathclaw, joined with hose clamps and a handle attached via threaded rod welded to wire to make a deadly handheld weapon.
Shem Drowne sword
Targets take radiation damage, although less than a simple legendary sword with an Irradiated effect. However, the effect applies radiation damage from two sources - pure radiation damage of 5, as well as a three second radiation damage over time effect, behaving akin to a poison.
Chinese Officer Sword
The Chinese officer sword has a medium swing speed and weighs 3 pounds. It is useful for dealing with melee enemies with heavier weapons and can be extremely effective when used by a high strength player character. The weapon can be modified with either a serrated blade (causing bleeding damage), an electrified blade (causing energy damage), or both.