Jordan is known to be quite a jerk, very self-centered and arrogant.
Basically, what Kevin Garnett is to opponents, Jordan was to his own teammates. Because Jordan was so important to the NBA, the media kept mum about it.
Lebron is a better athlete than Jordan (though IMO Bo Jackson was better than both, perhaps greatest American athlete ever.) Jordan's 40-yard and vertical are only slightly better than Lebron, who has 40-50lbs and 2 inches on Jordan. In terms of power, there's no equal. His first love was football, and he was recruited by Ohio State to be a wide receiver. He might have been drafted by the NFL.
In terms of skill and mental strength, it goes to Jordan. Imagine MJ in Lebron's body.