Flattener vs. Random

In theory, it should be possible to hit a flattener more often than a random movement because you know the flattener will avoid where it last was.

In practice, against top tier RoboRumble guns, which would be harder to hit, a typical flattener that logs where it last was and avoids it, or a type of random movement that moves to a random guessfactor each wave?

Thanks!