I mean, both are equivalent. But A15 over A14 is a strong selling point. If face id and modern looks is not important especially. Both are considered bad at battery, but se has a bit of advantage. 5g on the 12m is not considered a good feature to use either. So for a mom (person who couldn’t know or care about technicalities), if she does not have a favor towards the modern notch looking face id with straight edges, SE 3 can be the better option in many aspects. Touch id is only annoying when your hands are wet.