I made a melee char and have been trying out different melee weapons.
Among the slashing weapons:
Combat knife is pretty good, but the -3 accuracy penalty kinda sucks.
The machete is more damaging and has +2 accuracy, but it's so much slower.
Katana is even more damaging, but its even slower than the machete and only +1 accuracy. Probably good against high armor targets I guess.
Hatchet and Wood Ax are both kinda crummy. None of the others really stood out.
Among the bashing weapons:
The craftable nail board and hammer both seem pretty good. They're fast and reasonably high damaging with +1 accuracy.
The baseball bat is slower, more damaging, and +3 accuracy.
Regular old rocks make good improvised weapons, very fast hitting and decent damage. -1 accuracy though.
Nothing else really stood out.
Among the piercing weapons:
Wasp sting seems to outshine all the other pierce weapons. It's super fast - faster than all the other weapons I mentioned, and does more damage than even a steel spear. Bee stings are a close second, the same but for a bit less damage. Steel spears and wood spears are comparable to combat knifes and machetes and stuff, but they just can't compare with the insect stingers.
Wasp sting actually seems to be the best melee weapon in the game. Not only is it super fast and damaging, the piercing part of it keeps the enemy from attacking by reducing their moves. My char is running around cutting down whole swarms of zombies without being hit.
It should probably be nerfed a bit, but it's kinda fun to play with in its overpowered state