Usable capacity
Basket volume is only one part of capacity. Check the usable cooking area and the food portions you prepare most often, especially if you want ingredients to sit in a single layer for more even browning.
Countertop clearance
Compare the full appliance dimensions with the space around cabinets and walls. An air fryer also needs safe ventilation and enough room to remove the basket without blocking nearby preparation space.
Cleaning and power
Confirm which basket parts are removable or dishwasher-safe, the electrical requirements for your market, and whether the included accessories match the cooking modes you expect to use.