Ninja - Double Stack XL SL400 vs Tefal - ActiFry Genius XL 2-in-1

The Double Stack XL SL400 is the clear pick on raw spec strength, leading by 23.2 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 Double Stack XL SL400 if you care most about capacity and wattage. The biggest gaps in its favor are capacity, wattage, max temperature.

Pick the ActiFry Genius XL 2-in-1 if you care most about presets. Its strongest claims are presets.

Both ship with comparable dual zone, so those specs don't separate the two — focus on the differences below.

Bottom line: the Double Stack XL SL400 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.