I think what is missing here in the Lebron versus Melo debate is the non statistical, observational, intangible arguments.
1. In the playoffs, LeBron is agressive and thrives on pressure. The more pressure you apply to Melo, the more he plays outside. LA ratched up the defense and the pressure and Melo hung outside shot 40% and 25% from 3 point land. melo has played in 8 playoff series and had 3 good ones and his shooting has really struggled in the others because he's playing a tougher brand of ball. leBron has no such problems.
2. LeBron's going to get all the calls in the playoffs. We all know that. I don't care that Melo is a star he doesn't get the treatment from the refs that LeBron does.
3. LeBron, in my estimation from observations, makes his team mates better and Melo doesn't. Put good players around LeBron anf he would have won 2 championships already. Cleveland has had some not so great talent around him but the talent he has had he has made much better. AV is average at best on a non LeBron team. Boobie Gibson would never be open to hit threes on another team. West is at his best when playing with LeBron.
4. LeBron has an unbelievable effect on his home court crowds creating a great home court advantage. His ability to get hot at home and turn a quiet crowd into a raucous riot is game changing. Orlando has the home court.