It really depends on the writer's preference. Some fanfictions might have Naruto winning because of his unwavering belief in friendship and his ability to draw on the power of the nine - tails. Others might have Sasuke winning due to his strategic mind and mastery of the sharingan.
In a fanfiction scenario, it's really hard to say who would win between Gaara and Sasuke for Sakura. Gaara has his powerful sand control abilities. He can create huge sand constructs and has a very strong defense. On the other hand, Sasuke has his Sharingan which gives him enhanced perception and the ability to copy jutsus. Also, he has his own unique ninjutsu like the Chidori. If it's a battle just based on power, it could go either way. But if we consider their motives for Sakura, Sasuke might have an edge in terms of his past relationship with her, which could make him more determined to win this 'battle' in the fanfiction.
A plot development could be that Gaara and Sasuke start the fight. Sasuke tries to taunt Gaara about his past and how he could never truly understand Sakura like he does. Gaara, in response, shows his determination through his sand attacks. As the fight progresses, Sakura starts to see a side of Gaara she never knew, which makes her question her feelings for Sasuke. Meanwhile, Sasuke becomes more and more frustrated as he realizes he might be losing Sakura's attention, which makes him fight even more recklessly.
In other fanfics, Jason comes out on top. His leadership skills and ability to control the wind and lightning can give him an edge, especially when the battle takes place in an open area. Also, his Roman military training sometimes gives him an upper hand in strategic battles.
Wonder Woman usually wins in their encounters. She has a wide range of abilities. Her bracelets can deflect attacks, and she can fly, which gives her mobility that Poison Ivy lacks. Poison Ivy is mainly focused on her plant powers. Although she can create large and dangerous plants, Wonder Woman can use her indomitable will and fighting skills to break through Ivy's defenses. Also, Wonder Woman's experience in dealing with various threats in the DC universe gives her the knowledge and strategy to take on Poison Ivy effectively.
Well, in a 'gaara vs sakura fanfic', one might expect to see their different fighting styles clashing. Gaara has his sand - based attacks which are very powerful and defensive. Sakura, on the other hand, has her superhuman strength and medical ninjutsu skills. The fanfic could explore how Sakura might try to use her speed and strength to get past Gaara's sand defenses. Maybe she could use her medical knowledge to find a weakness in Gaara's body that the sand can't protect. It could also be about their mental states during the fight, like Gaara's past traumas affecting his fighting decisions and Sakura's determination to prove herself as a strong ninja.
In 'gaara vs sakura fanfiction', it could be about a fictional battle between Gaara and Sakura. Maybe it shows their different fighting styles. Gaara with his sand-based abilities and Sakura with her strength and medical ninjutsu. It might explore who would win in a one - on - one fight, taking into account their respective growth and skills.