Focus on capacity, cooking functions, and power output. A larger basket lets you prepare family‑size meals, while multiple presets (air fry, roast, dehydrate) add versatility. Also check wattage; higher watts usually mean faster cooking and better crisping.

Both offer 450°F max temperature, but Ninja emphasizes Max Crisp technology for extra‑crisp results, while Cosori highlights a 5‑fan speed system and ceramic‑coated basket for even cooking. Ninja provides six functions versus Cosori’s nine, and Ninja’s basket holds up to 9 lb of wings, slightly larger than Cosori’s 6‑qt capacity.

The dual‑basket design lets you cook two dishes simultaneously with independent temperature controls, saving time for busy families. It offers an 8‑qt total capacity, which is larger than most single‑basket models, making it ideal for meal‑prepping multiple sides at once.

Ceramic coatings are free of PTFE and PFOA, providing a healthier, scratch‑resistant surface that withstands high temperatures. Non‑stick coatings are often cheaper but may degrade over time; ceramic tends to last longer and is easier to clean.

A transparent window lets you monitor cooking progress without opening the basket, preserving heat and preventing over‑cooking. The LED touchscreen offers precise temperature and timer settings, which can improve consistency across different recipes.

Larger models, such as the 8‑qt Ninja DualZone or the 26‑qt Emeril Lagasse combo, can replace multiple kitchen appliances, offering long‑term savings. However, they also consume more power and require more countertop space, so weigh your household size against storage constraints.

Choose an air fryer with a dedicated dehydrate function and low‑temperature control, typically between 95–165°F. Models like the Ninja 4‑in‑1 Pro and the Gourmia XL include dehydrate presets, making it easy to make jerky, fruit chips, or herbs without extra equipment.