The Shark Robot vacuum is so clean, so one may suit you better than the other, depending on your needs. The Shark incurs lower recurring costs, has a longer maximum battery life, and delivers superior performance on bare floors and low-pile carpet. Meanwhile, the iRobot charges much faster, feels better built, clears more debris on high-pile carpet, maneuvers itself more effectively, and has more advanced automation capabilities, most notably its self-emptying compatibility and hazard recognition feature.