They're so close statistically and hardware wise, it's too close to call. That's why I like putting greats in tiers where each player is essentially equal to one another (post merger).
Tier 1: Michael, Kareem, Magic.
Tier 2: Shaq, Duncan, Bird, Lebron
Tier 3: Kobe, Hakeem, Dirk (I know this addition will receive criticism, but Dirk is superior to Kobe in pretty much every statistical measurement there is, from all around "raw" per game stats, advanced metrics, clutch stats, Finals stats, etc).
Tier 4: KG, Barkley, Robinson, Wade, Dr J, Moses Malone.
Etc, etc.