Originally Posted by fluffs

(...) if you've maxed out affection for the character, evolve them. Otherwise, you might as well leave them at max level for a while.

Just to be sure, do you mean the Affection boost x2 is only instant and does not work on later Gifts?
So, at the end...
[Affection +100 then Evolve]
...is better than...
[Affection +60 then Evolve then Affection +40]
... right?