Either one is fine by me, but when I was watching JoJo's Bizarre Adventure, I would watch Part 1 and Part 2 in dub, then watch Part 3 in its original audio because Jotaro was Japanese. For Part 4, I watched in dub because of Josuke's voice actor, who also voiced the main character in The Rising Of The Shield Hero. For Part 5, I watched the original because it hits better than the dub. As for Part 6, I'm not really sure because if I watch it, I'm going to be g**ning for Jolyne and Ermes throughout the whole series. But if I did, I would go for the dub since Jolyne is Italian-American. My best advice for anyone who is divided between Dub or Sub is to think of how you feel is best for your character's voice.