Comparison of "Aguri" & "Portrait of an Old Geisha"

In "Aguri," we really are seeing the world through Okada's eyes -- because, as you say, it's written in first-person, from his perspective. In "Portrait of an Old Geisha," we have much more distance from the story, because we're told the story from a third-person perspective -- and this leaves some more room for interpretation in the dynamics of the relationship.
Tanizaki shows us what the experience might be like for a man in his thirties who already feels his old age creeping upon him, who has had a relationship with a young girl since she was fourteen. We go more deeply into his insecurities, fantasies, and fears, because we hear them directly. On the other hand, we're not told directly why Kosono does what she does, or how she feels - we get glimpses, but it's the narrator's retelling of events. I'm left wondering what her insecurities, fantasies, and fears are, and I suppose I wonder about Yuki's as well. But the older figures in both stories are the ones that seem to be driving the relationships and the story, are the characters who appear most complex.