So many people say guns are better, or something like an axe. The ones that tried chainsaws, having seen too many bad movies, were dead pretty early. But knives don't run out of bullets and in a worst case scenario I can use my knowledge of knife fighting with anything that fits in my hand. Sure there are weapons that are easier to kill zombies with, but almost none that render them harmless as well.
Zombies may be able to keep moving after gun shots and all kinds of damage, but they still require all the same physical connections to function. Cut the wrist tendons and they can't grab you, cut the shoulder tendons and they can't reach for you, cut the Achilles and they can't follow you. More important, cut the jaw muscles and they can't bite you. And of course, cut the head off and they die for real.
I carry a convenient tool steel pick for the death blow, but if I get caught by a group somehow I just render them motionless and keep going. That annoys some people I've run into. They complain about finding clumps of zombies flopping around trying to pull themselves along with one hand or push themselves along with one foot. They generally shut up when I ask if they'd have preferred to find them up and fully capable.
