Look first at the cooking functions you need—air fry, bake, roast, dehydrate, etc.—because multi‑program models give more flexibility. Next, consider the temperature range; a higher max (up to 450 °F) helps achieve extra crispiness on foods like fries. Finally, evaluate countertop space and basket size to ensure the unit fits your kitchen and serves your typical portion size.

The Instant Pot Vortex Plus offers six cooking functions and a clear window for monitoring food, while Bella’s Slim models focus on a sleek, space‑saving design with a ceramic non‑stick coating. Both have 4‑quart capacity, but Bella emphasizes healthier, PFAS‑free cooking surfaces. If you value visual cooking cues, the Vortex may be a better fit; if you prioritize aesthetics and easy cleanup, Bella shines.

A higher max temperature, like the 450 °F Hi‑Fry technology in Chefman models, can give a deeper crunch and faster browning, which is useful for chicken tenders and thick fries. However, most everyday recipes stay below 400 °F, so if you mainly reheat or bake, a lower‑temperature unit such as the Ninja (105‑400 °F) will be sufficient and often cheaper.

For 2‑4 people, the Ninja 4‑qt air fryer provides solid performance with four built‑in programs and a ceramic‑coated basket at a competitive price. The Chefman models add a digital touchscreen and shake alerts for similar capacity, but they are priced slightly higher. Overall, Ninja balances features, durability, and cost, making it a strong value proposition.

Digital displays give precise temperature and time settings, plus preset programs that simplify cooking, which is helpful for beginners. Manual dials, like those on the Instant Pot Vortex Plus, are intuitive and often more durable, but they lack the quick preset shortcuts. Choose based on whether you prefer convenience (digital) or simplicity (manual).

Ceramic non‑stick coatings, featured on Bella models, are free from PFAS, PFOA, and PTFE, making cleanup easier and reducing potential chemical exposure. Traditional non‑stick surfaces work well but may wear over time. If you prioritize easy cleaning and a chemical‑free cooking surface, a ceramic‑coated air fryer is worth the extra investment.

While 4‑quart units are ideal for 2‑4 servings, many models—such as Bella’s XL basket—hold up to 3.3 lb of food, allowing you to cook larger batches like a family‑size portion of fries or chicken. For truly big meals, a 5‑quart or larger appliance would be more efficient, but the 4‑quart options can still handle modest batch cooking with careful stacking or using the dual‑zone feature on Bella’s TriZone model.

Chefman focuses on a compact design with a digital touch screen, shake notifications, and a 450 °F high‑heat option for extra crispness. Gourmia adds a 12‑function preset panel and FryForce 360° technology for even cooking, plus a dishwasher‑safe basket. If you want more preset versatility, Gourmia may be preferable; if you value a sleek, space‑saving unit with high‑heat capability, Chefman is a strong choice.