Personally my fav is part 5, hard decision since part 4 did have a lot of great stands, and I think they also had the most humanoid stands apart from part 6 right?.
That's what I was thinking... Along with the fact that it sort of gives insight to what Stand users are doing in other parts of the world unrelated to the joestars (even tho Giorno is one technically)
I'm actually planning on writing my own JJBA fan series that basically follows entirely different stories in the jojo universe separate from the joestars (for the most part)
Not really focusing on any canon characters like them... It's completely separate, but thanks! I'll try to do my best, still writing out the story for it and have a couple new stand ideas.