My oven doesn't have a convection option. My countertop toaster oven has an air fry function (basically making it a convection oven like you said). Unfortunately despite this function, it is far inferior to my actual air fryer when it comes to air frying food. There's a reason people buy dedicated air fryers vs using an oven with convection or air fry functionality imo, and it's not just about space and energy efficiency.