the Smart Oven vs Crispi 4-in-1 Portable Glass Air Fryer Cooking System: which is safer?

Where these two actually differ

• We flag PTFE fume risk (non-stick coating on removable trays), Tempered glass degradation or breakage and Bacterial or mold growth in glass-sealed chamber on the Breville and not on the Ninja.
• We flag Thermal fracture or stress in glass cooking vessel, Plastic housing off-gassing (VOCs and formaldehyde) and Electrical hazard or heating element degradation on the Ninja and not on the Breville.
• The Breville is stainless steel, quartz heating element, tempered glass door where the Ninja is Glass cooking vessel with stainless steel and plastic components, which is most of the difference in these two grades.
• These two are level, close enough that price and fit should decide it rather than our grade.