The outcome could be that they both realize they were wrong. Maybe Naruto discovers the truth about Hinata being framed and they make up.
Or the fight could end in a draw. They both are strong in their own ways. Naruto with his brute strength and Hinata with her precision and byakugan abilities. After the draw, they might start to respect each other's skills more and it could lead to a new phase in their relationship, like a deeper friendship or even the start of a romantic relationship as they start to train together to improve their skills.
In this fanfic, it could be a fight in an alternate universe where Naruto and Hinata belong to rival clans. Their clans' long - standing feud forces them to fight each other. However, during the fight, they start to realize that the feud is baseless and they might even develop a new understanding of each other and their clans' history.
In a fanfic setting, if the fight is about who Naruto would choose, Hinata might have an edge. She's been in love with Naruto for a long time and has shown her feelings more openly in the end. However, Sakura has been Naruto's teammate for a long time and they share a deep bond. So it's a really tough call.
Hinata would be overjoyed. She has loved Naruto for a long time, so his proposal would be like a dream come true for her. She might start crying tears of happiness and immediately say yes without hesitation.
In such a fanfic, Naruto might become more in tune with his emotions. Hinata is known for her calm and perceptive nature. She could teach Naruto how to better control his chakra in a more gentle and patient way compared to some of his other teachers. This could lead to Naruto developing new and unique jutsu that combine his natural exuberance with Hinata's precision.
Hinata would probably be extremely shy at first. She might blush furiously and be at a loss for words. After all, she has had a crush on Naruto for a long time, so it would be a dream come true for her.
The outcome in this fanfiction could be a draw. Naruto and Hinata would put up a great fight against Pain. Naruto would be all fired up, using his Rasengan and other ninjutsu. Hinata would be there, protecting Naruto's blind spots with her gentle fist techniques. But Pain is no pushover. His ability to control gravity and rain down destruction could keep Naruto and Hinata at bay, leading to a situation where neither side can fully defeat the other.
Naruto would probably be extremely hurt. He has always considered Hinata a friend and perhaps more. Betrayal from her would be a huge blow to his trusting nature. He might initially be in denial, not wanting to believe that Hinata could do such a thing.
There would be a lot of shock and disappointment among fans. Naruto and Hinata are a beloved couple, and fans who have followed their story would find it hard to accept such a plot. Many would probably criticize the author for going against the essence of the characters.
In a fanfic like this, it might start with Hinata feeling neglected by Naruto due to his busy Hokage duties. Kiba, being an old friend, is always around to offer support. But this is a very uncharacteristic plot as Hinata is deeply in love with Naruto in the original series. It would likely cause a lot of drama and conflict within the Konoha community.
Naruto would likely become more responsible. He's used to being the hero, but now he has to be a father too. So he might cut back on some of his risky adventures to be there for his family. Hinata would become more confident as a mother. She's always been a bit shy, but with a baby to protect, she'd find her inner strength.