For the suns, you clear Chris Pauls contract and gain cap flexibility while also getting a player who can still keep you contending as a playoff team. You also get a potentially valuable first which you can either keep, or later flip in a HUGE package for a costar for Devin booker (Suns have 5 tradeable firsts after this trade, putting them in prime position to acquire a MAJOR superstar when one becomes available).
For LA, you put all your chips on the table to maximize the remainder of Lebrons career. You now have:
PG: Chris Paul SG: Patrick Beverly SF: Lebron James PF: Jae Crowder C: Anthony Davis
Depth: Schroder Walker Reaves Hachimura Bryant Brown Jr. Gabriel JTA Christie Saric
This is a title contender in my eyes. Chris Paul complements Lebron and AD much better than Russ, and will get them crazy good looks. While the big 3 carry the offense, Beverly and Crowder secure the defensive end of the ball (not to mention you have AD). You also have very quality bench players to support.