For me, it’s if it HAS a notch = then NO sale.
Also, no headphone jack = no sale.
Also, rounded edges, or missing bezels = no sale.
Also, size and shape (and placement of buttons, switch, etc.) not identical to the 5S/SE = no sale. Pretty much if they don’t revive the SE, (or come out with an SE 2,) no sale.
My iPhone SE and its four potential replacements that I already own, (when and as replacing each becomes necessary,) should last me, if I’m careful with them, which I am, the rest of my life. (That was on purpose. I’m not paying even more money for LESS iPhone.)
As always, if and when the last one dies, and I have no more, and they don’t make them anymore, I’ll switch to something else. I categorically refuse to buy a crappier phone for more money just because Apple’s corporate vampires tell me I must.
I know I’m starting to sound like a broken record here, but it bears repeating. Screw the iPhone 6, 8, 8, 9, and 10 or whatever they’re on now. Every one of them, as far as I’m concerned, is defective by design. They’re designed to cost nearly (or over) a thousand dollars each, (which is ABSURD) and have fewer features, and be more fragile and easily broken with each successive generation, and I’m not paying ANY money for THAT, let alone MORE than my last one cost.