My gut feeling is that if Lebron really does come to LA next season, it will be as a Clipper.
But, he's going to look at this from every possible marketing and dollar maximization angle before making a decision, as I believe that is going to play a major part of the last few years of his career.
For the Clippers, it likely starts with retaining Paul, possibly Blake, and maybe acquiring Carmelo (on the cheap). (Ditching DeAndre probably wouldn't hurt either). If they still have a nice nucleus heading into next off-season, I could see Lebron joining them.
Now, if Lonzo truly shows himself to be a transcendent PG, then maybe Lebron decides to play with him, as long as another star comes along. He knows that a core of those 3 will attract veterans on the cheap, it almost always does.
For now, though, I think the Clippers have the edge.