iRobot Roomba i4 vs iRobot Roomba 694 [690, 692]

The iRobot Roomba i4 is better than the iRobot Roomba 694. The i4 has fewer parts that require regular cleaning and a smart-pathing navigational system, which yields superior maneuverability. The i4 does a better job cleaning debris on low- and high-pile carpets. Meanwhile, the 694 clears more debris on bare floors, has a bigger dirt compartment, and lasts longer on a single charge, though this can vary in the real world.