Technical abilities aren't all that different towards an oven but convenience is at least compared to my conventional oven

Airfryers are alot quicker. modern models dont even require preheating so there is much less need to plan ahead.

The results is also much crispier (from trying to simulate a fryer) so some stuff intended for oven actually tastes better from an airfryer, i find more and more boxes of fried stuff like chicken nuggets that are intended for air fryers that ovens used to struggle with. (At least subjective tastewise) there is one exception which is pizza, i am rather peculiar in how i like my pizza. Reheating a slice does work but conventional oven absolutely wins the pizza game.

Its somewhat easier to clean and maintain, most parts fit in the dishwasher, may vary by model.

bonus is energy efficiency but admittedly the real major reason i and my household love it is the super low bar of a quick easy meal where before we defaulted much more to junk. It made a measurable positive difference to our diet without to much conscious effort.