We have a Cuisinart counter top convection oven. We use that a lot more than our regular ovens. The regular ovens are only used when something is too big for the counter top oven.
HOWEVER, now that we have an air fryer, we use that ton's more than the counter top convection oven. To my thinking, you would need a very large air fryer (which we have) to take over for a convection oven. There are air fryers that look just like a convection oven. That's because they really are nothing more than a convection oven ... just renamed. My daughter had one of this type, and never used it. Why? Because you have to use oven mitts of pot holders to get stuff out of them. Because you can't easily shake or stir things in them (they have little shallow pans that don't support this). Really, this type of air fryer is nothing more than a convection oven. Convection ovens and their air fryer twin type can get to be impossible to clean once you start cooking crumb-producing things (like toast) in them combined with grease-producing things (like french fries, chicken strips, etc.) There are so many nooks and crannies and slots and holes and burners in there that you just can't easily get around everything for a good cleaning. Most have a glass door that can get incredibly nasty after food that splatter and pop to any extent.
Now, the air fryers that have a removable basket that you can shake did not appeal to me initially one little bit. I was looking for the more conventional "convection oven" type. My daughter warned me against this. Don't confuse this warning as a slight against convection ovens. Those types of oven are good. But they are NOT air fryers, so it's unrealistic to expect them to be, despite how they may be advertised. They are convection ovens with an "air fryer" tag slapped on them. A marketing move. A large basket-type air fryer is quite different than a convection oven. Much faster, and more convenient. One heckuva lot easier to clean too. But even the largest basket-type air fryer is only good for two people, three max (if you don't eat terribly much). So there's a trade off. FWIW, the air fryer that we have is a Cosori Dual Blaze model. It's about as big as they come, and has a square basket which is much more useful (holds more food) than the round basket type.
Either a convection oven or an air fryer will beat a microwave for most all uses around our house. The microwave is good for reheating many things (except meat). It's not very good for actually cooking things. Pretty terrible at that, actually.
We have lots and lots of small kitchen appliances - rice cookers, steamers, waffle irons, George Foreman grills, espresso machines, Keurig coffee makers, Instant Pots, Crock Pots, sandwich grills, electric tea pots, blender, food processor, etc. Looking around my kitchen, these are the items that have a permanent place on the counter: Microwave, convection oven, air fryer, electric can opener, Keurig coffee maker. Everything else is put away after use, and pulled back out again as needed. If I only had counter space for two items to sit there permanently, those two would be the Keurig coffee maker and the air fryer. I never would have believed an air fryer would be in the top two, until I purchased one. But as I said, get a large one of the basket type (that is highly rated and easy to use).