Breville - Smart Oven Air Fryer Pro vs Ninja - Double Stack XL SL400
Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Breville - Smart Oven Air Fryer Pro | Ninja - Double Stack XL SL400 |
|---|---|---|
| Capacity | 26 L | 9.5 L |
| Wattage | 1800 W | 2400 W |
| Presets | 13 | 6 |
| Dual zone | false | true |
Between the Smart Oven Air Fryer Pro and Double Stack XL SL400, the Smart Oven Air Fryer Pro comes out ahead in capacity / presets, while the Double Stack XL SL400 wins on wattage / dual zone. Overall, the Smart Oven Air Fryer Pro scores 85.6 and the Double Stack XL SL400 scores 76.5 on our Mars Score.
Which should you buy?
The Smart Oven Air Fryer Pro is the clear pick on raw spec strength, leading by 9.1 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
Pick the Smart Oven Air Fryer Pro if you care most about capacity / presets. The biggest gaps in its favor are capacity, presets. The single most decisive one: Capacity — 173.68% more. 26 L vs 9.5 L.
Pick the Double Stack XL SL400 if you care most about wattage / dual zone. Its strongest claims are wattage, dual zone. The single most decisive one: Wattage — 33.33% more. 2400 W vs 1800 W.
Both ship with comparable max temperature, so those specs do not separate the two — focus on the differences below.
Bottom line: the Smart Oven Air Fryer Pro is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Which should you buy: Breville - Smart Oven Air Fryer Pro or Ninja - Double Stack XL SL400?
Breville - Smart Oven Air Fryer Pro leads the current Mars Score by 9.1 points.The more useful decision is the trade-off behind that result: compare capacity, wattage, dual zone, presets against the way you will actually use the product.
Choose Breville - Smart Oven Air Fryer Pro if…
Breville - Smart Oven Air Fryer Pro has the measurable edge on capacity l, preset count.
Choose Ninja - Double Stack XL SL400 if…
Ninja - Double Stack XL SL400 has the measurable edge on wattage w, has dual zone.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Breville - Smart Oven Air Fryer Pro wins
- ▲Capacity — 173.68% more. 26 L vs 9.5 L.
- ▲Presets — 7.00 more. 13 vs 6.
Why Ninja - Double Stack XL SL400 wins
- ▲Wattage — 33.33% more. 2400 W vs 1800 W.
- ▲Has Dual zone.
Spec comparison
Capacity
| Spec | Breville - Smart Oven Air Fryer Pro | Ninja - Double Stack XL SL400 |
|---|---|---|
| Capacity | 26 Llead | 9.5 L |
| Dual zone | false | truelead |
Power
| Spec | Breville - Smart Oven Air Fryer Pro | Ninja - Double Stack XL SL400 |
|---|---|---|
| Wattage | 1800 W | 2400 Wlead |
| Max temperature | 232 °C | 232 °C |
Features
| Spec | Breville - Smart Oven Air Fryer Pro | Ninja - Double Stack XL SL400 |
|---|---|---|
| Presets | 13lead | 6 |
| Smart app | false | false |
| Dishwasher-safe | true | true |
| Noise | 60 dB | 60 dB |