Bob Marley as a brand and image is so much bigger than James and Bob’s music. You have 15 year old kids that have probably heard one Bob Marley song in their life wearing clothes with his face on it. As far as international facial and name recognition, Bob is bigger.
But if we are only considering their music, James cast a far larger shadow. He is not only one of the major pillars of Funk,
Soul, and R&B, he was also a large influence on Rock, Pop, and various other music genres. He also was the biggest influence on Michael Jackson, the most successful music act of all time.