Ninja
Foodi Dual Zone Series
Dual zones for smart cooking, but baskets are small.

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Absolutely I have Ninja Foodi Smart XL Grill and we use it nearly everyday day you can grill chicken with nice charr in about 15 minutes or less I make it for salads, chicken teriyaki, for chipotle style burritos, you can definitely make steak, french fries come out just like they’ve been deep-fried you can toast sandwiches literally everything bagels use it like a toaster over makes great grilled cheeses reheats food very well.
I have the ninja XL smart grill. It does a lot and it is the easiest air fryer for the kids to use too. I've made just about everything in it from steaks to flatbreads. It's a footprint but instead of warming up the big oven for / whatever / I can just bake, grill or air fry. Edit: often in a fraction of the time.
I have the ninja smartXL and it replaces just about everything I do in the oven except bake bread. Only because I bake a few loaves at a time. I would 100% go for it. Less heat in the house too.
I have that along with a cheaper air fryer. The ninja foodi is a wonderful device. Particularly for cooking steaks. But it can be a pain to clean and it doesn't do well for things like french fries or chicken nuggets. I would go with just a generic cheap air fryer to start. We use our cheap air fryer every day. The ninja foodi only gets used when it's too cold to grill outside.
Can’t really comment on a thermomix, but we use our air fryer daily. We use it instead of the oven 99% of the time, it’s a lot quicker both in terms of heating up and cooking things. https://ninjakitchen.co.uk/product/ninja-foodi-max-health-grill-air-fryer-ag551uk-zidAG551UK
Ich liebe meinen. Ich hab auch ne ninja. Mit Grillfunktion - AG551 Recht groß. Pommes passen 1kg rein und werden deutlich besser als im Backofen, Gekauft für weniger als 1/3 vom Neupreis über Kleinanzeigen
We have a Ninja Foodi Grill XL which is also an air fryer. It gets used all the time, and we clean if after every use. I like that it has multiple functions in addition to air fryer.
Ninja
Foodi Dual Zone Series
Dual zones for smart cooking, but baskets are small.

COSORI
Turbo Blaze 9-in-1 6QT
Quiet, easy to clean, but lacks a viewing window.

Ninja
Foodi Air Fry Oven Series
Flips up to save space, but shallow and air fries poorly.

Breville
Smart Oven Air Fryer Series
Oven replacement; spacious, but air frying and cleaning divide users.

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

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