Breville - Smart Oven Air Fryer Pro vs Ninja - Double Stack XL SL400

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 and presets. The biggest gaps in its favor are capacity, presets.

Pick the Double Stack XL SL400 if you care most about wattage and dual zone. Its strongest claims are wattage, dual zone.

Both ship with comparable max temperature, so those specs don't 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.