WunderWaffe DG-2. It is much more difficult to use than the Thunder Gun...and honestly, when it lights up a line or cluster f/k of Zombies, it looks awesome!
wounderwaffe hands down.. one shots kills all zombies and it looks beast... thundergun is good but sometimes u have to like shoot 2x becus the zombies stand up...
i voted thungergun because it is the best out of those but if i had to choose out of all the guns in zombies i would choose any machine gun over all of those because wonder weapon have always been bad with points and that is their fatal flaw