Do you mean you own and regularly use all of these? From a brief search, am I right in thinking they are all pretty similar? Some have a feature more / less e.g. pressure cooking
Is that just if you can’t fit everything in one or if you need to run a combination of cooking types like oven and slow cooking?
The first was the Instant Pot Duo, which I bought mainly to replace a different sous vide machine I had and to pressure cook.
Have used the air fryer function a few times.
Bought the Ninja Foodi Max Health grill next as the price was good and is used pretty much all the time, with the temp probe being an added bonus.
Next was a the Ninja Speedi, which again was a good price and is used mostly atm to do complete meals that for example require steam and or air fry.
Yes, very similar, with slight differences, which if you use/need are a real bonus.
We can on occasion have all three running at the same time for larger meals, complex, batch cooking or a complete breakfast.
The Instant Pot will accept just about any size chicken, which the Foodi, would struggle on a medium and the Speedi I would say, would also accept a large chicken (all within reason)
Most of the time, with just being two of us, we can load up the Speedi and make a meal ready to eat in one hit, or use that for roasts etc, while the Foodi is taking care of a large cut of lamb.
Instant Pot hardly gets much use, but now and then I will do a 50hr sous vide, or use it to turn stewing steak into Korean shredded beef in 25 minutes.
Bit of a waffle and sea of text and hope it made sense.