They look roughly equivalent to me, hard to say if one is much better than the other.
I do like the proportions of the facial features on the newer on better though! Exaggerating the features more (going full rounded on the chin, making the eyes larger, making the mouth larger), they make the whole face look more balanced.
In the older one, since the face/chin is a more realistic pointy shape, it looks quite a bit too wide (like 1.5x wider than one would expect) and the mouth seems too small as well.
So I think there are definitely subtle improvements on the new one after all~