, it's always best to find what Dell part number works.
it's not worth it, sata is sata. no reason to use m.2 when a 2.5 form factor will be just as fast.
That's not what I'm saying. I'm saying that as a general rule you need to look at the Dell's part number to find parts from other manufacturers that are compatible.
But yes I agree that sata is sata. For a desktop/laptop nvme or sata ssd doesn't matter though. Only matters in benchmarks.