Ninja
Foodi Dual Zone Series
Dual zones excel, but bulky with small baskets.

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I have the Ninja DCT401 12-in-1 Double Oven and use it frequently. It does have two sections but they do different things. I rarely use both at the same time; usually I’m either baking on the top or air frying on the bottom.
I have the Ninja 12-in-one. I use the regular oven when whatever I’m cooking is too big for the ninja.
I'd get a "Ninja Double Door 12-in-1 Countertop Electric Convection Oven & Air Fryer with FLEXDOOR" I was gifted one and thought it would be lame. Boy was I wrong. We barely use our main oven anymore unless we're making a large roast or something that won't fit in the mini oven. Wait for a sale.
We have a Ninja 12-in-1 double oven with FlexDoor. Love it. Our oldest has since moved out, but we were a family of 5, the oldest been a teen boy with a voracious appetite.
I'm not a big fan of the ones that seem to be the most popular. You should buy the largest one you can afford and have counter space for. It's really a convection oven and if you have the room you could cook a chicken I have the Ninja dual oven where the bottom is an air fryer in the top is a toaster oven, I don't use it everyday, I use it several times a day I also received as a gift one of those that has the three stackable trays. It's okay but you have to rearrange the trays from time to time if you're cooking something that takes a while. And yes I do use both
They don’t have anymore, so glad I got it when they did, I don’t even use my oven anymore
We have a Ninja Double Stack XL Countertop Oven and Air Fryer. They cost about $300. Just my wife and I in the house. We love it. About the only time we use our regular oven is when we are making cornbread in a cast iron skillet or baking a big pizza.
Ninja
Foodi Dual Zone Series
Dual zones excel, but bulky with small baskets.

COSORI
Turbo Blaze 9-in-1 6QT
Effortless to clean and quiet, but no viewing window.

Ninja
Foodi Air Fry Oven Series
Unique flip design, but shallow and air frying debated.

Typhur
Dome
Self-cleaning and quiet, but expensive with shallow interior.

Breville
Smart Oven Air Fryer Series
Great oven replacement with large capacity, but poor air frying.

Ranked #1
Ninja - Crispi Pro 6-in-1 Countertop Glass Air Fryer

Ranked #1
Breville - Smart Oven Air Fryer Series

Ranked #1
COSORI - Turbo Blaze 9-in-1 6QT

Ranked #1
Ninja - Crispi Pro 6-in-1 Countertop Glass Air Fryer

Ranked #1
Ninja - Foodi Air Fry Oven Series