One minute you’re watching R2-D2 save everybody’s skin. The next, the T-800 is walking through a wall while WALL-E is making you emotional over a trash compactor. Movie robots have given us killers, heroes, sidekicks, leaders and machines with more personality than half the humans around them. Does Optimus Prime overpower the field? Can the Iron Giant or Baymax win on heart? Or does R2-D2 beep his way to the top? There’s no clean answer—and that’s the point. Vote through the head-to-head matchups and decide which machine deserves the crown.