Which couple believes you that is better developed in the male's side feelings to the girl? NH or SS? Only considering the evidence of the manga.
In terms of Part 1, they were developed relatively equally in my opinion. Because both Naruto’s and Sasuke’s opinions of Hinata and Sakura gradually changed, from a rather negative outlook, to a much more positive and endearing one.
For instance, Naruto went from thinking that Hinata’s “a world class freak”:
To thinking that she’s someone he really likes:
It was basically the same situation for Sasuke’s sentiments towards Sakura. He went from initially thinking that she’s nothing but annoying:
To thinking of her as one of his “precious comrades”:
In the same way, both were a little bit hampered during Part 2. Naruto because of his lingering feelings towards Sakura, and Sasuke because of the Curse of Hatred which had a firm grip on his heart. However, the obvious difference is that people never questioned whether Naruto cared at all about Hinata, but they did for Sasuke towards Sakura, because due to his hatred, at one point he would have killed anyone and anything that looked at him the wrong way.
Yet, if you paid attention enough, you could see why Naruto and Sakura strove to save Sasuke as much as they did, because they knew that beneath all of his hatred on the surface, his true self was still salvageable.
