Roborock S7 wins on hard floors.

Yes. If you have mostly hard floors and want a robot that both vacuums and actually mops, get the Roborock S7 over the Roomba j7+.

The Roomba j7+ is great at avoiding obstacles and emptying itself, but its mopping is basically a damp cloth dragged behind it. The Roborock S7 has sonic mopping — it vibrates 3,000 times per minute and actually scrubs. On hard floors, that’s the difference between smearing dust around and cleaning.

Also, the S7 navigates better on bare floors. Roombas rely on bumping into things to learn the layout. Roborock uses LIDAR to map your entire floor in minutes and avoids furniture legs. No bumping. No getting stuck on a dark rug.

The j7+ wins if you have lots of cables or pet messes it needs to avoid. But for hard floors? The Roborock cleans deeper and more efficiently. Spend the savings on a better mop solution.

You want a cleaner floor, not a smarter trash can.