I think you could get away with an oven and a deepfryer with everything, but in my experience an airfryer is generally faster than the oven, and less oily than a deep fryer (I wanna say more healthy but I don’t really know enough about the details, so I’ll just stick to the objectively “less oily”).

I use it for fries (sweet potatoe fries most often), anything resembling nuggets (like vegetarian nuggets/schnitzels, other veggy pattys, falafel), fry-snacks (eggrolls, samosa, bitterballs), and you can get a bit adventurous with trying our breads, vegetables, or other stuff that you would just plop in the oven.