Find a really good site or book for these things as everything except pressure cooking can be done in these.I think I'm in the pressure cooker scares me camp.
I can't cope with any gadgets that seem too complex.
Maybe in better off realy good slowcoker and reasonably priced air fryer to satisfy hubby's urge found one on amazon that looks good.
You can cook a cake, a whole chicken, cook rice etc in a slow cooker and the air fryer is great for chips, roast potatoes, crisping up things like the whole chicken you just cooked in the slow cooker
I have had my slow cooker for proberbly 35 years and it's still going strong with the same pot. Had my air fryer for around 2 years, I now have an air-fry oven as got rid of my cooker so gave my airfryer away