The Instant Pot's great, one of the only appliances that's properly worth the hype/investment/kitchen real estate. It's almost impossible to fuck something up in there, and you can do a sauce/stew/curry that would take 3-4 hours on the stove in less than 20 minutes, not only without sacrificing any flavour, but actually improving it sometimes. Clean-up's a piece of piss as well, which is invaluable for me. For simple batch cooking of anything, there's nothing I'd rather use.
I haven't experimented with air-fryers yet, but I've heard good things.