Statistical comparisons are flawed. It doesn't take into consideration many factors that include 1) eras of play, 2) opposition available (i.e 16 clubs, 23 clubs, 30 clubs - squads gets thinner as league expands), 3) system(s) a player performs within, 4) positions played, and probably a few more. Kobe nor James were finished products at ages 18-21, and James developed quicker as he was simply a beast of epic human proportions. A one-off mix of size, height, speed, power. Yet there are stories of Kobe destroying American and European pros at age 16 when playing pickup games with his dad. He was certainly a quality player and when he arrived in LAL he had time to develop whereas James was thrust right into the limelight of a woeful Cavaliers side. Comparing their stats (and Jordan's) at comparable ages/seasons in the league is seriously flawed.
And my two cents - Kobe's two greatest offensive outputs, 81 points in one game and 62 points when he outscored Dallas (a 50+ win club) through three quarters (sat fourth quarter), are arguably the greatest one-off offensive performances in league history. A guard must create his shots, must make those shots outside 10-feet (for the most part) and Kobe is arguably the greatest shooter in league history (again, shooting percentage statistics will skewer reality), where as a guy like Wilt was so superior size-wise that he dominated the league for years. It was far easier for Wilt to get 100 than Kobe to get 81 or 62-in-3 due to Wilt being able to get multiple dunks/layups/shots inside 8-feet. LBJ is similar to Wilt in that he simply is so more powerful than any player in the league and combined with his ball-skills and speed he simply dominates. But that's also because he's a great player, just like Kobe and Wilt, and easily all three are in the Top 10 of all-time.
People love to hate on Kobe because of his personality. But make no mistake about it - he has that killer mentality, that "I will beat you now" attitude, only rivaled by Jordan in his quest for winning at all costs. Had Jordan played in today's era with social and 24-hour media following every move he wouldn't be as universally loved. Some of his personal flaws would be far more exposed, sort of like his HOF speech which was horrendous and showed his true character - that of an assassin and one that held grudges. We apparently are supposed to find that admirable in Jordan but loathe Kobe for the same trait. It's also that Kobe plays for the Lakers - the marquee club of the league and just like all-time greats for Dallas Cowboys and NY Yankees, a Lakers player is subject to far more scrutiny and dismissal simply because of the club he plays for.
Btw, Kobe has five championships, two of which he was the leading man (and Shaq doesn't win three with LAL without Kobe's support), James has one title, possibly a second on the way. Kobe lost once with the best team in the league (2004) and in 2008 the Celtics were clearly a better side. LBJ could be on the verge of his second Finals loss with the best team in the league (2011, 2013?). That said, championships and title losses shouldn't be the biggest category that defines greatness as it is a team effort and without a team effort a superstar player won't win (see Ewing, Barkley, etc.). However, when trying to identify GOATs championships and title losses must be included.