It´s impossible to compare this 2 players i.m.h.o.
Basketball has changed a lot in this (not so many) years. Players are now faster and stronger, defenses have improved a lot, rules have changed, etc...
I think Jordan is the best because of his pursuit of perfection and his stellar appearences echa and every time he was needed. He was like one of those heroes from comics, he alwayd delivered when the game was on the line. Despite all the changes I think Jordan could adapt quite fast to current basketball.
However, because of the changes I've mentioned I truly believe a pleyer with the talent, speed and strenght of Lebron playing in the later 80s and 90s would have been the best player cause he would have been ahead of his time, exactly as Jordan but better because of physical attributes.
Conferencia de prensa de asunción del nuevo DT: http://www.youtube.com/watch?v=r1yG0dgFO5Q