Roborock S8+ vs Roomba j7+: Mopping Power or Obstacle Avoidance?
By Lisa Wang · July 27, 2025 · 6 min read
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These are three self-emptying robot vacuums that clean in very different ways. The Roborock S8+ has the strongest suction and a vibrating mop, the Roomba j7+ has a camera that steers around cords and pet waste but does not mop, and the Roborock Q7 M5+ is the cheaper LiDAR model with a simple mop pad. Specs are listed in the same units so the trade-offs are visible.
Which One Should You Get?
- Best for hard floors where one machine must vacuum and mop – Roborock S8+ – the strongest vacuum of the three, with a vibrating mop and LiDAR mapping.
- Best for cluttered homes and pet owners worried about accidents – Roomba j7+ – a camera-guided vacuum that avoids obstacles rather than scrubbing floors.
- Best for a hard-floor home on a smaller budget – Roborock Q7 M5+ – the cheaper LiDAR option with a self-emptying dock and a basic mop pad.
Mop and suction, camera, or budget LiDAR: three self-emptying robot vacuums
Pros
- 6,000 Pa suction, far above the other two
- Vibrating mop that lifts automatically
- About 180 minutes of runtime
- LiDAR navigation with a self-emptying dock (up to 60 days)
- DuoRoller brush that reviewers say copes with pet hair
Cons
- Socks and cables on carpet can still catch it
- Reviewers report durability problems between 18 and 36 months
- Customer support scored 1.5/5 on Trustpilot
Unique Features & Insights
Pros
- Camera-based PrecisionVision spots socks, shoes and pet waste
- Self-emptying base, up to 60 days
- Top-three pet hair result in TechGearLab testing
- Compact dock
- Works with the iRobot app, virtual barriers and room maps
Cons
- No mop
- Runtime about 85 minutes in one comparison
- Weaker on hard floors in testing
- Crossed virtual barriers in testing
Unique Features & Insights
Pros
- 10,000 Pa suction listed
- LiDAR navigation with a self-emptying dock (7 to 9 weeks)
- Mopping scored well on hard floors
- Up to 180 minutes of runtime
- Dual anti-tangle system for pet hair
Cons
- No obstacle avoidance
- Pet hair scored 2.6/10 at TechGearLab
- Single mop pad that cannot lift over carpet
- Owners report it getting stuck
Unique Features & Insights
Final Comparison Table
What decides it is mopping against obstacles. If you have hard floors and want one machine that vacuums and scrubs, the Roborock S8+ is the pick: 6,000 Pa, a vibrating mop and about 180 minutes of runtime, with owners reporting weak spots on carpet with socks and cables and durability issues after 18 to 36 months. If your floor is cluttered, or you have pets and fear what a robot might run over, the Roomba j7+ is the one, because its camera is the best at spotting obstacles in the comparisons we read, but it has no mop and a shorter runtime. If you want self-emptying and LiDAR for the least money, the Roborock Q7 M5+ does hard floors well, but it ranked 20th of 23 in one lab test, with poor pet hair results and no obstacle avoidance. Check current availability through the links above.
Frequently Asked Questions
Which robot vacuum has the best obstacle avoidance?
The Roomba j7+. Its listing describes PrecisionVision Navigation that avoids socks, shoes and pet waste, and an RTINGS comparison says its camera is better than Roborock at spotting and reacting to obstacles. The Roborock Q7 M5+ lacks obstacle avoidance according to Vacuum Wars.
Can any of these also mop?
The Roborock S8+ has a vibrating mop that lifts automatically, and the Q7 M5+ has a single detachable pad with three water levels. The Roomba j7+ does not mop: mopping needs the separate j7+ Combo.
Do all three empty themselves?
Yes. The Roborock S8+ and Roomba j7+ listings say up to 60 days of dust, and the Q7 M5+ listing says 7 to 9 weeks. The docks use disposable bags: 2.5L on the S8+, 2.2L on the j7+ and 2.7L on the Q7 M5+, according to reviews.
Which is best for pet hair?
It depends what you fear. TechGearLab put the Roomba j7+ in its top three for pet hair and praised its pet-waste avoidance. Robot-review.com says the S8+ handles pet hair well thanks to the DuoRoller brush. TechGearLab scored the Q7 M5+ 2.6 out of 10 for pet hair.
How long do the batteries last?
The S8 family is rated for 180 minutes and the Q7 M5+ for 180 minutes by the maker. A side-by-side at Overeview lists about 85 minutes for the Roomba j7+, so it may need a recharge to finish a larger home.
Is there a newer model of each?
Yes. Robot-review.com names the Roborock S8 Pro Ultra as the S8+ successor, the Roomba Combo j7+ adds mopping to the j7+, and the Q7 M5+ is listed as an upgrade from the Q5 Max+.
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