Who are the best people to have on your side if there was a zombie invasion?

The Zombies themselves.

No, seriously. Not only would you need a ma-hoo-sive army to combat them with, and pretty much the whole terrified world, you'd have to negotiate with them and try to ocme ot peaceful arrangement. If not that; kill 'em all. Sorry, zombies--its the rifle for you, I'm afraid. Not.