Roborock S8 MaxV Ultra vs Roomba j9+
The Roborock S8 MaxV Ultra ($1,400) is the better overall robot vacuum — it offers 10,000 Pa suction, sonic mopping, corner-cleaning FlexiArm, and a fully automated dock. The iRobot Roomba j9+ ($600) is better specifically for pet owners thanks to its tangle-free rubber brushes and superior pet waste detection. Get the Roborock for best all-around cleaning; get the Roomba if pets are your primary concern.
Side-by-Side Comparison
| Feature | Roborock S8 MaxV Ultra | iRobot Roomba j9+ |
|---|---|---|
| Price | $1,399 | $599 ✅ |
| Suction | 10,000 Pa ✅ | ~2,200 Pa |
| Mopping | Sonic + FlexiArm ✅ | None ❌ |
| Pet Hair | Good (brush roll) | Excellent (rubber brushes) ✅ |
| Dock | Full auto (empty/wash/dry) ✅ | Self-empty only |
| Navigation | ReactiveAI 2.0 + LiDAR ✅ | PrecisionVision camera |
Suction Power
Winner: Roborock S8 MaxV Ultra (10,000 Pa vs ~2,200 Pa)
The Roborock has nearly 5x the suction power. On hard floors, both perform well. On carpets — especially medium and high pile — the Roborock pulls significantly more embedded dirt. iRobot's Carpet Boost helps, but can't overcome the raw physics difference.
Mopping
Winner: Roborock S8 MaxV Ultra (the Roomba can't mop at all)
This isn't close. The Roborock has a sonic mopping system that vibrates at 4,000 times/minute plus a FlexiArm side mop that extends into corners. The Roomba j9+ is a vacuum-only unit with zero mopping capability. If you have hard floors (tile, hardwood, laminate), this alone may decide the purchase.
Pet Hair Performance
Winner: iRobot Roomba j9+
The Roomba's dual rubber brush extractors are the gold standard for pet hair. They maintain constant contact with floor surfaces and never tangle — even with long human hair mixed in. The Roborock uses a traditional brush roll with rubber fins, which is good but requires occasional manual de-tangling after heavy pet hair sessions.
Obstacle Avoidance
Winner: Tie
Both excel here but differently. The Roborock's ReactiveAI 2.0 uses 3D structured light to identify 70+ objects. The Roomba's PrecisionVision uses a front-facing camera — it's specifically excellent at detecting pet waste (a critical feature for dog owners). Both reliably avoid shoes, cables, and toys.
Dock & Maintenance
Winner: Roborock S8 MaxV Ultra
The RockDock Ultra handles everything: empties dustbin (7 weeks capacity), refills water tank, hot-washes mops, and hot-air dries them. The Roomba's dock only empties the dustbin (60-day capacity). You never touch the Roborock's dock for weeks; the Roomba still requires you to manage water/cleaning if you had a mopping model.
The Verdict
Buy the Roborock S8 MaxV Ultra if:
- You want the best overall cleaning (vacuum + mop)
- You have hard floors that need regular mopping
- You want maximum automation (hands-off for weeks)
- Budget isn't the primary concern
Buy the iRobot Roomba j9+ if:
- You have dogs or cats and pet hair is the main problem
- You primarily have carpeted floors
- You want proven reliability and great customer support
- You want to spend $800 less
Frequently Asked Questions
The Roomba j9+ is better specifically for pet hair thanks to its dual rubber brush extractors that never tangle. However, the Roborock S8 MaxV Ultra is the better overall robot vacuum with superior mopping, suction, and a more automated dock. If pet hair is your #1 concern, get the Roomba. If you want the best all-around cleaning, get the Roborock.
For most households, yes. The Roborock S8 MaxV Ultra offers superior suction (10,000 Pa vs ~2,200 Pa), mopping capability (the Roomba j9+ can't mop at all), and a more automated dock. The Roomba only wins on pet hair management and waste avoidance. Roborock is the better value and more feature-rich.
The Roborock S8 MaxV Ultra's RockDock Ultra is the best dock on the market. It auto-empties the dustbin, refills the water tank, hot-washes the mop pads, and hot-air dries them. The Roomba j9+'s dock only empties the dustbin — no water, no mop, no drying.
Last verified: May 28, 2026