It's hard to pinpoint a single 'strongest stand' in Jojo manga. Different stands have unique abilities and advantages. For example, The World has the power to stop time, which gives it a significant edge in many situations.
The unique concept and high-energy action scenes usually make a rail gun manga stand out. The imaginative technology and intense battles capture readers' attention.
There's no way to really tell if it's common specifically for someone named Jojo. However, in general, reading fanfiction is a popular activity among fans of many different franchises. The Jojo series has a large and dedicated fan base, so it's likely that there are fans named Jojo who partake in reading fanfiction, but we can't say for sure how common it is without more data.
Perhaps this Jojo is interested in exploring different interpretations and stories within the Jojo universe that fans have come up with. Fanfiction often takes the existing characters, settings, etc. from the original Jojo series and creates new and unique storylines. So, this Jojo might be a big fan of the series and wants to see what other fans have imagined.
The story's exploration of morality and what it means to be human in a world of advanced technology is another factor. It delves deep into these topics through the experiences of the characters, which is different from many other light novels that may focus more on simple adventure or romance.
The unique setting. Instead of the traditional sword - based combat in Sword Art Online, this one focuses on gun - based battles. It gives a fresh feel to the whole series.