Better argument for robots is that they're more complex to make. Resistance groups can bomb factories disabling manufacturing of the enemy. With zombies however, while they may be easier to kill, their numbers are basically infinate because they are dead people. To strike at their source we'd have to kill ourselves and burn the bodies.
Moreover robots require power. So far what we know of zombies they don't exactly starve to death when they don't get any brains. But if my LG smartphone only runs for a day on a battery, how much would a robot require? Fuel cells are another thing where we can create a bottle neck for their supply need.
Strategical possibilities against robots are much better. They are complex and when we reduce the world to rubble the harder it will be to keep cutting edge tech running. While we're biological and go back to agricultural society and rebuild.
I'd take my chances with robots. Chances are their running on windows anyway, then we just have to wait till they crash.
Edited by Alyster, 22 December 2013 - 11:17 AM.