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The most important thing is that you don't necessarily need an expensive brand - mid-range models often make just as good food as the pricey ones. I've had good experiences with models that are simply built and have less fancy stuff, because then there's less that can break. Check out the reviews to see if people talk about durability, not just their first few uses.
What often gets overlooked: pay attention to the size and how full you pack it. Even a good air fryer will cook unevenly if you stuff the basket too much. When it comes to the brand itself, I'd rather look at customer reviews for durability than go by the name - there are really solid no-name devices out there that last for years, while some well-known brands give up the ghost after two years.
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