I'd recommend starting with the most popular ones on websites like Archive of Our Own. They usually have a good summary that can give you an idea if it's the type of story you'll like.
One great Spider - Man and She - Hulk fanfiction is 'The Team - Up'. It has an interesting plot where they have to solve a mystery in New York City together. The way the author writes their interactions is really engaging.
I'm not sure who the absolute best is, but there are some well - known writers in the fanfiction community. Some writers who have a great understanding of both characters' personalities and powers tend to write really engaging stories. You can often find them by looking at the reviews and ratings on fanfiction websites.
Spider - Man in Marvel vs Capcom fanfiction also represents the idea of a street - level hero in a world full of powerful and sometimes god - like beings. His down - to - earth nature, despite his superpowers, makes him relatable. Fanfiction writers often use this aspect to create interesting story arcs, like Spider - Man having to prove himself among the more 'cosmic' characters in the Marvel vs Capcom roster.
The Kingpin could be a great antagonist. He's always been a thorn in Spider - Man's side, and his criminal empire and resources would pose a major threat to both Spider - Man and She - Hulk. He could hire super - powered mercenaries to fight them.
One storyline could be Spider - Man and She - Hulk teaming up to stop a powerful villain who is stealing experimental technology from Oscorp. Spider - Man uses his agility and web - slinging skills while She - Hulk uses her super strength. Another could be a story where they get transported to an alternate dimension and have to find their way back home while facing strange new enemies. Maybe they also have to deal with a misunderstanding between them at first, like Spider - Man thinking She - Hulk is too reckless, but then they learn to work together effectively.
One great crossover could be a story where She - Hulk and Spider - Man team up to take on a powerful new villain in New York City. Maybe a villain with the ability to manipulate technology and they have to use their combined strength and agility to stop him. Another could be a more comical crossover where Spider - Man accidentally swings into She - Hulk during one of her law - related outings, leading to some chaotic and funny misunderstandings as they figure out how to work together.
One great storyline could be She - Hulk and Spider - Man teaming up to take on a powerful new villain in New York City. Maybe a villain who has the ability to manipulate the legal system and is causing chaos for She - Hulk in her day job as a lawyer, while also creating dangerous situations for Spider - Man on the streets. They have to combine their skills, with She - Hulk using her legal knowledge and brute strength, and Spider - Man his agility and web - slinging skills to bring the villain to justice.