So I will own up to voting SOI.
Yes, I do like it and think it's a powerful image of holding on to one's innocence. Like the Innocence live shows and songs themeless, it's part of the best overall album and tour package since Pop as well. If Peter Saville had used a found image or an original photo (live or sculpture) of father and son in this pose for Joy Division, everyone would have said it was cool.
I was disappointed SOE wasn't better represented (and similarly edited to reflect a companion piece) by the cover. If they had to use family, one of their parental shots (there are quite a few band parent photos in the archive) could have been more successful.
My ranking:
SOI
NLOTH
ATYCLB
SOE
HTDAAB