Most toaster ovens, even ones with strong convection for "air frying", are not quite consistent enough in their heating. You have to pay far more than you would for an air fryer to get even heat coil distribution and a good door seal for that. The specific kind of rapid cooking that dessicates and browns the surface you get out of air fryer devices is just kind of hard to replicate outside of them.

If you ever look inside an air fryer you can kind of immediately see why -- the heater-to-volume ratio is absurdly close. You have the equivalent of the biggest coiltop stove burner directly above a few quarts of air volume with a fan forcing air from it to circulate. It's just kind of unfair of a comparison for both toaster ovens and even full-size ones that advertise an "air fryer" mode by comparison for that reason.

I like it because it's easier and quicker to put a few chicken legs in the basket than to put them on a tray in the toaster oven.

That and our toaster oven is too complex but our air fryer is two dials.