We have had several air fryers in the past and the insides of the trays turn black within 3-6 months, no matter how careful we have been in washing them according to instructions and this is extremely disappointing.
After googling for several days, I came across the Ninja Foodi Dual Zone Air Fryer AF300 which states "first air fryer with 2 independent 3.8L baskets that let you cook 2 foods, 2 ways, at the same time, not back-to-back like a traditional single-basket air fryer" There are almost 5000 reviews on this product, mostly 5-star.
After being impressed with these features and looking at reviews, we made the plunge and purchased this fryer. We have cooked all sorts of foods in this machine from raw vegetables (making chips), to frozen products and use it every day, several times a day. It has a huge 7.6L capacity with 6 cooking functions - Air Fry, Air Broil, Roast, Bake, Reheat, and Dehydrate.
This fryer is so versatile with its 2 separate compartments and you can cook and separate different foods and "match" them to finish cooking at the same time if items in one compartment take longer the the other compartment. Absolutely brilliant and we all love this feature so much and so time saving in having to do things differently before air fryers existed, or with our other previous air fryers we had. Otherwise you can simply cook using just the one compartment for brilliant results also.
One bug bear has always been that fryers (as well as pizza trays) go black eventually. A $7 pizza tray after a year is acceptable- just throw it out and buy another one, but when it comes to all our previous air fryers, the supposed non-stick trays going black after just 3-6 months is disgusting and is a common problem with all other air fryers, even expensive one that we have had, BUT- 13 months on and used several times a day, our Ninja fryer is as clean as the day we purchased it! How can you better that?
A warning though- a lot of people mentioned there is a nasty chemical smell when first used and we found this also, but if you google how to get rid of chemical smell in air fryers, and follow the steps as we did and "sanitised" about 4 or 5 times, then its been faultless ever since.
This has to be the best cooking appliance we have in the house for every day use.