You can't compare the two. Look at each as individuals. They have each changed the game of basketball in their own way. There will never be a single "GOAT". Every generation builds on what the generation prior created. Dr. J -> MJ -> Lebron. All dominate players in their own era that made everyone around them, and after, better players.
Could You please elaborate on how LBJ changed the game? I think, currently Curry did with his shooting skills, and somewhat Harden too - tho I hate the step-back threes due to it should be called travelling at least one out of three times. LBJ: great skill-set, great athlete but changing the game?
I think many, like myself, will concede this point. Harden is a genius at "hacking" basketball. I don't really complain that what Harden does is traveling as much as the traveling rule needs updating so that it is.
changed the game by jumping teams to play with other superstars so that he could win. Definitely started the big three era until the warriors dynasty ended. Back to big twos and it's so much more interesting when 6-8 teams can win.