While it was well do ented that both are highly inefficient players who benefited greatly from a soft league that opened up the perimeter for higher ratings, I will have to pick Kobe on this one despite AI being one of my favourite players to watch.
Ai's highest WS season was 00-01, in which he had 11.8 WS (0.190 WS/48). The self-proclaimed Black Mamba (not to be mistaken for a female fictional character) had 6 seasons of > 11.8 WS, and 9 seasons of > 0.190 WS/48 seasons.
From a winning perspective though, AI was able to drag a bunch of role players to the finals, while Kobe, with a similar supporting cast, couldn't even crack the playoffs. I can never really understand this part though.