Both models offer the same 6‑in‑1 functionality and Smart Cook System with a built‑in thermometer, but the DG551 features an updated, sleeker exterior design. The FG551 is the original version, while the DG551 may have minor firmware improvements. Capacity and cooking performance are essentially identical, so choose based on aesthetics and price.

The Ninja focuses on indoor grilling with cyclonic 500°F air and a dedicated grill grate, whereas the Nuwave emphasizes versatile convection baking and a wider temperature range (50‑500°F). Nuwave offers 12 cooking functions and advanced airflow for faster, crisper results, while Ninja provides a built‑in thermometer for precise protein doneness. Consider whether you prioritize grill marks or multi‑rack baking flexibility.

The Ninja Foodi Smart XL can hold up to six steaks or 24 hot dogs, allowing you to cook mains and sides simultaneously, which saves time during large gatherings. If you frequently prepare meals for four or more people, the larger basket reduces the need for multiple cooking cycles. For single‑serve or small‑family cooking, a standard‑size air fryer may be more economical.

Liners protect the basket from grease and simplify cleanup, especially when baking sticky foods, and are heat‑safe up to 450°F. A stainless‑steel spatter shield catches oil splatters, keeping the heating elements clean and adding a safety layer. Both accessories are optional but can extend the life of your appliance and reduce maintenance effort.

Ensure the plate matches your specific Power XL size (5QT, 6QT, or 7QT) and is made from food‑grade materials like carbon steel or stainless steel with a durable non‑stick coating. Features such as a handle for easy removal and dishwasher‑safe construction add convenience. Compatibility and build quality are more important than decorative design.

The built‑in thermometer offers four protein presets and nine doneness levels, removing guesswork for steak, chicken, fish, and more. It monitors internal temperature in real time, adjusting the grill or air‑fry cycle to reach the target doneness. This precision leads to consistently juicy, evenly cooked meals.

Yes, the grill, air crisp, roast, bake, broil, and dehydrate functions cover most tasks performed by a conventional oven, plus the added benefit of faster cooking due to high‑velocity air. However, the interior space is limited, so large baking projects may still require a full‑size oven. For everyday cooking, the combo can replace several countertop appliances.

The ability to adjust top and bottom heater percentages and fan speed lets you fine‑tune the cooking environment for specific foods, such as creating a crisp crust on pizza while keeping the toppings moist. This level of control can produce professional‑grade results that standard air fryers cannot match. It’s especially useful for advanced home chefs who enjoy experimenting with textures.