As far as I can tell, across the SE network, according to each site's help center on the topic, the accepted answer is chosen by the OP as most helpful / informative to the asker.
I asked a question: Why doesn't the Enter key send EOL?
and got two great answers:
one, written by Thomas Dickey, an author of xterm and many unix applications and utilities, which directly and clearly answers my question.
Nominal Animal wants me to change the accepted answer on the basis theirs is Not An Answer, and doesn't attempt to answer the question. I don't believe this to be the case, but I'm afraid Nominal will delete their answer.
I believe the correct thing to do is not waver in my choice of acceptance, but my question for meta is twofold:
is what I believe the correct thing to do, actually correct?
Can a Moderator prevent Nominal from deleting their answer? I think it's quite valuable.