To me the biggest difference between them is clutchness.
By that, I mean the ability to score the very last ball of a game.
Jordan was the best ever by a mile on that. LeBron - despite his historical clutch performances throughout games, when he was possibly facing more pressure than any other player ever faced - simply doesn't have a jumper good enough to make him the go-to definer of the very end of games.
In the Lakers 3peat era, Shaq was their best player, but Kobe was the last shot guy. Today, we all know LeBron is Cavs best player, but the last shot will go to Kyrie.
It's not because of choking or anything like that, but because of his characteristics - LeBron is a slasher, a driver and a playmaker, before a shooter.
Jumpshots are what close games are decided on, as officials are allergic to fouls on drives that take place in the last moments of a game.
So in the very last play,normally the best shooter shoots a jumpshot. That's how it has always been, I believe. I don't have many accounts of big guys like Shaq repeatedly making the last shot of games.
In Lakers 3peat era, Shaq was their best player, but the last shot went to Kobe.
In today Cavs, LeBron is the best player, but the last shot will go to Kyrie.
So, in the waning moments of a game, you may give the ball with LeBron- but not necessarily for the last shot, but to find someone for the last shot.
This is a big deal in basketball. We all have fun watching games go down to the last shot, and only a very few are go-to guys for these moments.
Actually, this is a very important trait of dominance. This is the utter dominance a player can exert on court. Jordan did it, and LeBron can't fully do it.
So this is basically what separates them to me.
Also, as great and accomplished as LeBron is, I have the impression he has showed to be much more flawed - and as consequence, more human - than Jordan. He had huge growing pains, and actually this goes to value his accomplishments, as no player had ever faced such big scrutiny.
It's like Jordan is god, infalible, and LeBron is the best among men.
But I'm sure this feeling is also media driven, as the idolatry Jordan reached was unparalalled.