From basketball perspective, I don't see any difference between Lakers and Suns. They are both very young teams with players who are maybe talented, but still unproven (unlike Jayson Tatum and Jaylen Brown, who, even though young, showed they can play at really high level already). Also, both teams would have to be taken to pieces in order to acquire LBJ. Then it would probably be Booker, Jackson and the pick vs Ball, Kuzma and Ingram and I don't see considerable difference there YET.
That said I just don't see LeBron taking his talents to Phoenix, because I see better franchises basketball-wise (like San Antonio, Boston or Philly) and cities which LEBRON IS MORE ATTRACTED to (Cleveland, LA). In no way I want to say Phoenix is a bad city to live in as I've never been there.
You can also put it this way - it would be like leaving your girlfriend (Cleveland) for some random girl (Phoenix), whereas going to LA would be like dating a celebrity if you get what I mean. :)