M0nica
Doodledog I have got a number of small pottery dishes that fit neatly into my round air-fryer. They are sufficiently large to hold two good size portions of food, and as there are only two of us in the household.
None of them were bought specially. They were all pots that I already used regularly to cook meals for the two of us.
None of mine (other than tapas ones) would fit in mine. I have the smallest Pyrex one (half a litre?), and that fits, but the handles mean that there is not space to get it in and out easily without spilling the contents. It's not big enough for two decent portions anyway - I think it was meant for serving side vegetables.
That's the main thing that puts me off the Ninja. The machine is large, but the style means that you have to reach down into the pot to get things in and out, which is tricky when it's hot, as it's deep. I have numerous racks, so that you can cook more than one thing at a time, but they are faffy, as they are collapsable and tend to collapse . It's great for chips, or things that would otherwise be fried, as you just need to shake the pot to cook evenly, instead of rotating the height of the shelves, as you do in the other one, but things like yorkshires are much easier in the shelf one (mine's a Tower 5 in 1), as a 4 hole tray fits in perfectly and they cook really well.
It really does just come down to preference though. There's no 'best' one, which is why anyone considering one should think about what they will use it for most.