This Oster French Door air fryer oven is more versatile and a better value. I've owned that model for about a year and I use it nearly every day, sometimes multiple times per day.
There aren't many air fryers that can cook: 2 XL 14" pizzas, a full-size 90oz frozen family lasagna, full-size casserole dishes, some cast iron dutch ovens will fit for pot roasts and slow cooking.
A cheap $50 basket air fryer for quick and small items + this large air fryer oven is more practical than a dual basket air fryer of any kind. Dual-basket air fryers don't let you cook big items like pizzas, rib racks, lasagna, casseroles, large layer cakes, lots of garlic bread, cookies, brownies, etc. Anything long or big doesn't fit in the small baskets.
I have several convection toaster ovens. None of them have a seal to hold in steam or smoke. I wouldn't want it to hold in steam in any case, because that will reduce browning and crisping. I don't need it to hold in smoke because I don't let it make smoke. If it makes smoke, that's my fault, not the oven's fault. If I let oil or food drip on the bottom heating elements, that's just stupidity to not foresee the obvious fact that food will drip oil, grease and moisture on the elements unless I put a tray underneath it.
It's easy to find non-stick crisping baskets with trays to fit these ovens. I have several of these. Therefore I'm not usually burning anything to generate smoke.
I'd be interested to see how someone would try to measure the temperature accuracy of this kind of oven because there would be many problems trying to do so. The Breville uses 5 quartz heating elements that heat via convection and infrared radiation. It would be difficult to measure the heating performance even with an expensive FLIR camera.
I could see the same review being written about my favorite oven, the Oster French-Door style Air Fryer for $169.05 during the Prime day sale, and yet it would poorly reflect how great these models are for reasons I think are entirely due to the inexperience of the buyer, not real problems of the ovens themselves.
I think Breville is generally overpriced, so I have no reason to defend their products in general.