That really depends on personal preference. However, some popular ones often have a great balance between action and character development. For example, stories that explore how Goku's relationships change after getting Ultra Instinct can be really engaging.
Well, a great 'goku get ultra instinct fanfiction' story would be one that not only focuses on the power - up itself but also delves into the consequences. Some stories might show how Goku's new form affects his battles against stronger foes like Jiren. They might also explore how his friends and family react to this new level of power. There are also stories that take a more creative approach and have Goku use Ultra Instinct in unexpected ways, like solving non - combat - related problems. These kinds of stories add a new dimension to the fanfiction world. It's all about finding the ones that resonate with you in terms of plot, writing style, and the way they handle the characters.