It is not even close, Jay-Z has more influence. Kobe Bryant doesn’t have much influence outside of maybe making people want to play basketball and buy his sneakers. Athletes rarely get into political issues or speak out much about anything. I can’t remember Michael Jordan ever addressing issues going on in the world. Rappers on the other hand speak on what is going on in the world, past and present. They make you think about society and your life(not all of them of course).
Athletes could have a stronger influence but they avoid speaking on what is going on in the world. I can’t blame them, I would rather focus on making millions and giving money to charity. Kobe Bryant may be more well known in the world, but he is known mainly for his skills on the court.