Who are you buying for?
The same book reads differently depending on who gives it. A grandparent far away is making a different point from a parent at bedtime - so each of these says what to choose and what to write inside.
For a son
a hero story he will want read one more time, every night
See what to chooseFor a daughter
an adventure where she is the recognizable star on every page
See what to chooseFor a grandson
a keepsake from grandparents he will treasure - even from far away
See what to chooseFor a granddaughter
an heirloom book with her face on the cover, from someone who adores her
See what to chooseFor a niece
the gift that makes you the favorite aunt or uncle
See what to chooseFor a nephew
a one-of-a-kind adventure starring him, not another toy
See what to chooseFor a friend's child
the party present that is not more plastic, and the one the parents keep
See what to chooseOr for a grown-up, from the children
For dad
a book he is in, written from the child who thinks he hung the moon
See what to chooseFor mum
a story she is inside, told by the child she reads to
See what to chooseFor grandma
the book that gets read on her sofa, with her grandchild as the hero
See what to chooseFor grandparents
one story with both of them in it, and the grandchildren as the heroes
See what to chooseOr start from the occasion instead.