Ninja Foodi DZ550 vs Gotham Steel Air Fryer

The Ninja Foodi DZ550 is a better choice than the Gotham Steel Air Fryer for most people; it offers superior air frying performance and works faster. Air frying with the Ninja results in mostly crispy, well-browned food, while the Gotham Steel leaves a larger portion mushy or burnt. 

The Ninja has two baskets and a 'Smart Finish' feature, so you can cook different foods simultaneously and set them to finish cooking at the same time. 

It offers a range of temperature settings, fan speeds, and cooking presets, and even includes a temperature probe, so you can easily make various recipes. Conversely, the Gotham Steel is limited to basic air frying with a single fan speed. That said, the Gotham Steel is more compact, so you may prefer it if you have limited space and don't need the extra features.