Any answer to this question is going to be controversial. However, in my opinion, the title of Greatest Of All Time belongs to Micheal Jordan. 6-0 in the finals speaks for itself, and he accomplished that in limited time (13 years).
My personal GOAT is Kobe Bryant because he had the biggest impact on my life and my love for the game of basketball. He is the reason I coach the way that I do. The way he played the game and went about his life is an inspiration for all youth players.