1. Design & Build Quality

Both the DREAME L40s Ultra and DREAME L40 Ultra Gen 2 follow Dreame’s premium robot vacuum design language, featuring a sleek circular body paired with a multifunction docking station. These models are designed not only for cleaning performance but also to look modern inside contemporary homes. The finish quality, materials, and compact body style feel premium on both units.

The L40s Ultra focuses more on simplicity and value. It offers a clean design with standard brushes, dual spinning mop pads, and a refined dock system that delivers all the essential hands-free features most users need. It is ideal for buyers who want a flagship look without paying flagship pricing.

The L40 Ultra Gen 2, however, takes the engineering further. It includes an extendable side brush and extendable mop mechanism, which physically move outward to reach corners, wall edges, and awkward areas under cabinets. These moving components make it feel more advanced and purpose-built for deep whole-home cleaning.

If you value elegant simplicity, the L40s Ultra is excellent. But if you want the most advanced cleaning hardware, the Gen 2 feels more premium and innovative.

Winner: L40 Ultra Gen 2

2. Suction Power & Vacuum Performance

This is where the biggest difference appears.

The DREAME L40s Ultra delivers 13,000Pa suction power, which is already very strong by robot vacuum standards. It can easily handle everyday dust, crumbs, hair, sand, and general debris on hard floors and carpets. For most households, this level of suction is more than enough for excellent daily maintenance cleaning.

The L40 Ultra Gen 2 jumps dramatically to 25,000Pa suction, placing it in flagship territory. That extra power is especially useful for:

• Deep carpet dirt extraction
• Thick rug cleaning
• Pet hair removal
• Heavy dust environments
• Larger homes with more traffic

If you have carpets, pets, children, or outdoor dirt entering the home daily, the Gen 2’s stronger suction gives noticeably better deep-cleaning potential.

For standard homes, both are powerful. For demanding homes, the Gen 2 clearly leads.

Winner: L40 Ultra Gen 2

3. Mopping Performance

Both models use Dreame’s DuoScrub mopping system, meaning they use rotating mop pads instead of passive drag mops. This creates better pressure and friction on floors, helping remove footprints, sticky spots, and dried stains more effectively.

The L40s Ultra performs very well for routine wet cleaning. It can vacuum and mop in one run, then automatically wash its mop pads at the dock and dry them with hot air. This dramatically reduces manual effort.

The L40 Ultra Gen 2 improves on this by adding an extendable mop arm, allowing one mop pad to reach closer to walls, corners, and tight edges where many robot vacuums leave dirty strips. This is especially useful in kitchens, dining areas, and along room borders.

If you mainly want routine floor freshness, both are strong choices. If you care about maximum edge mopping coverage, the Gen 2 wins.

Winner: L40 Ultra Gen 2

4. Carpet Detection & Smart Floor Adaptation

Both robots are designed for mixed flooring homes and include intelligent carpet detection systems.

The L40s Ultra uses ultrasonic carpet sensing and can automatically lift its mop pads up to 10.5mm when it detects carpet. It also boosts suction automatically, allowing it to move from hard floor to carpet without soaking rugs.

The L40 Ultra Gen 2 goes further by offering multiple carpet strategies:

• Carpet avoidance
• Automatic suction boost
• Intensive carpet cleaning
• Mop lifting up to 0.41 inch (about 10.4mm)

This allows users to customize how the robot behaves depending on carpet type and cleaning priority. Homes with delicate rugs, medium carpets, and hard flooring will benefit from this flexibility.

If your home has mostly tiles or hardwood, both are fine. If you have many rugs or carpeted rooms, Gen 2 is smarter.

Winner: L40 Ultra Gen 2

5. Navigation & Obstacle Avoidance

Navigation quality is extremely important in robot vacuums, and both models perform well here.

Both units feature:

• Smart Pathfinder mapping
• 3DAdapt obstacle avoidance
• Room-by-room mapping
• Efficient route planning
• Multi-floor map storage

They can detect and move around common obstacles such as shoes, cables, furniture legs, pet bowls, and clutter. Both should navigate efficiently without random bumping or missed zones.

Since both use similar Dreame mapping technologies, real-world navigation performance should be close. Unless one receives future software upgrades, there is no major gap here.

Winner: Tie

6. Battery Life & Runtime

Both models are powered by a 5,200mAh battery, but actual runtime differs slightly.

• L40s Ultra: up to 260 minutes
• L40 Ultra Gen 2: up to 231 minutes

The L40s Ultra offers longer rated runtime, likely because it uses lower suction power and fewer active extension mechanisms. This makes it a better fit for very large homes where longer continuous cleaning is important.

The Gen 2 has shorter runtime on paper, but it also uses stronger motors and more advanced systems. In many cases, it may still clean efficiently because it can finish jobs faster with stronger suction.

For pure battery endurance, the L40s Ultra wins.

Winner: L40s Ultra

7. Docking Station & Hands-Free Maintenance

Both robots include premium all-in-one docking stations that greatly reduce maintenance.

Shared dock features include:

• Automatic dustbin emptying
• Mop washing
• Hot air mop drying
• Water refill system support
• Long hands-free cleaning cycles

This means you do not need to empty dust daily or wash mop pads manually after each run. For busy households, this is one of the biggest reasons to buy either model.

Both also mention optional cleaning solution auto-fill modules depending on region or package.

There is no meaningful difference in everyday convenience.

Winner: Tie

8. Smart Features & App Control

Both models support app-based control for mapping, room selection, scheduling, no-go zones, suction adjustment, and cleaning customization.

The L40 Ultra Gen 2 adds stronger voice assistant integration with:

• Alexa
• Siri
• Google Home

This makes it easier to start cleaning hands-free using voice commands.

The L40s Ultra supports app control well, but the Gen 2 is the better smart-home choice for users already invested in voice ecosystems.

Winner: L40 Ultra Gen 2

9. Pet Hair & Family Home Performance

For pet owners, robot vacuum performance matters a lot.

The L40s Ultra includes a TriCut anti-tangle brush, designed to reduce long-hair wrapping around the brush roll. This is very useful for homes with pets or long-haired family members.

The L40 Ultra Gen 2, while not emphasizing TriCut in the same way, offers significantly stronger suction and targeted pet-zone cleaning support. This means it can collect fur, litter, dust, and tracked dirt more aggressively.

If tangles are your main concern, the L40s Ultra is appealing. If maximum hair pickup is your goal, Gen 2 is stronger overall.

Winner: L40 Ultra Gen 2

10. Price & Value for Money

Price difference is substantial:

• L40s Ultra = $469
• L40 Ultra Gen 2 = $649

That means the Gen 2 costs significantly more. However, it also offers:

• Nearly double suction
• Extendable cleaning systems
• Better carpet modes
• More voice support
• Stronger premium performance

The L40s Ultra remains the value champion because it still includes a self-empty dock, mop washing, strong suction, excellent runtime, and smart mapping at a much lower cost.

If budget matters, L40s Ultra is smarter. If performance matters more than price, Gen 2 justifies the premium.

Best Value: L40s Ultra
Best Premium Choice: L40 Ultra Gen 2

Final Detailed Verdict

Choose the DREAME L40s Ultra if you want premium features at a lower price. It is excellent for most homes and offers impressive suction, long runtime, anti-tangle cleaning, and a fully automatic dock.

Choose the DREAME L40 Ultra Gen 2 if you want the strongest overall performance. Its 25,000Pa suction, extendable edge cleaning tools, smarter carpet behavior, and stronger smart-home integration make it the superior robot vacuum.

🏆 Overall Detailed Winner: DREAME L40 Ultra Gen 2