I am more concerned about the difference between a convection oven and an air fryer. If I don't consider health issues, I will choose an air fryer, which is not expensive.
But I'll take the health factor into consideration, the plastic liner of the air fryer contains a carcinogen - Teflon, which is the last thing I need.
I would consider a combi oven maybe it should be called an air fryer, I saw it on amazon and I think it works great because it's so easy to set up, now I don't even use my big oven anymore (too power hungry) . I would recommend it HYSapientia.