Kobe over Jordan? 
No doubt.
Kobe has hit some of the greatest game winners that I have ever seen. Few examples:
1. The two buzzer beaters in Portland back in 04.
2. The game winner in 1998 vs the Sonics (Could be another team), where he came from no where and tipped in a missed free throw.
3. The game tying floater that sent the game in OT against the Suns in 06 playoffs. Then came back and hit the game winning shot in OT.
4. Kobe's game winning layup in 2000 finals vs the Pacers.
The degree of difficulty for those shots that I listed are insane.
Best shot maker that I have ever seen.