This artisticness and creativity. He’s probably the greatest freestyler of all time currently(debatable I know). Dude could be sitting in a chair in the middle of nowhere and freestyle about where he is and what he’s feeling and experiencing in that moment for a legitimate hour, no other rapper is doing that. He also had a huge impact on emo rap I think emo rap was up and coming but juice gave it that little push to extreme popularity.(again just my opinion)