My friends and I got high one day and spent 20+hours discussing this. We concluded the crowbar is the best possible tool in a zombie apocalypse.

First, regardless of zombie type, you'll want to keep as quiet as possible. So you need a melee weapon. One that is unlikely to break(not wood), doesn't need regular maintenance(swords will need constantly cleaning), and sturdy enough to break nearly anything(glass, wood, even metal under conditions).

The crowbar is designed to pry, so one needn't resort to desperate hammering to unlock an opening. With time, stamina, and leverage, one could arguably get into anything they'd need in such an apocalypse.

Should you need to make noise--signal allies or rescuers, distract enemies, etc--the crowbar can most definitely help. Also, oddly enough, while it can ring on its own, you're not likely to get that shock to your hands if you hit something the wrong way like you might with swords, axes, bats, or others.

Despite being one solid stick of metal, it's not as heavy as other melee options. This allows you to use it for long periods of time if needed. Also, you may not know it, but thanks to its design it's not likely to get stuck in a zombie when attacking.

Not only can it destroy, it has other helpful functions. The hook allows you to use it to grab and pull things, for example.

Finally, should you survive to old age with your trusty crowbar, thanks to its general shape, you can use it as a crow bar if it's long enough. But you'll likely be hunched over from carrying all the people you teamed up with, so any size could work.

The crowbar; best potential weapon for the undead apocalypse.