I agree with you that MJ is the GOAT for sure. I do think that LeBron has the chance to overtake him in terms of "career", but he'll never be able to surpass Jordan in terms of "prime" of their career. The only way LeBron can overtake MJ is by winning multiple more championships as the best player on the team. I think if LeBron can get to five championships, it will be enough to close the gap in the argument of who was better.
As for who I would start a team with? I think I'm still going with Jordan since I'm GUARANTEED at least a couple championships with Jordan no matter what.