Lebron has more triple doubles because his game is closer to the basket and he has 2 inches/50 lbs on Kobe. Kobe is probably the most adept facilitator at the 2 the game has ever seen. Both are incredible defenders with Kobe being a better man defender and Lebron a help defender and versatile defender. Lebron is not the threat Kobe is from anywhere on the floor or has the footwork and consistency on his jumper. Lebron makes up for it with his efficiency and consistent scoring. Kobe is the better off the ball player and shooter, though they both are high usage players.
Lebron has more triple doubles because he's a much better passer and has better awareness on rotations than Kibe does. Kobe is a good passer but he has tunnel vision when it comes to offense.
Kobe isn't a better on-ball defender, his defensive prime was just in a time where he could handcheck. Lebron is literally a DPOTY contender as a perimeter player, ins league where the rules are now skewed to let Offensive players flourish. Let Lebron be able to hand heck and be a lot more physical and he'd be, by far, one of the most terrifying on-ball defenders.
Kobe is the better shooter and has a more versatile scoring set while Lebron is the better slasher and probably one of the best finishers around the rim ever. The mere threat of Lebron's drives Plus his awareness and passing make him have a bigger offensive impact despite Kobe being a better scorer.
When it comes down to it, Lebron can get the ball in the basket at a more efficient rate while being a better playmaker, more impactful defender, and a better rebounder. He doesn't have the same "scoring mentality" that Kobe does but he puts up similar numbers.
Look at this...
35.4 PTS on 45% (27.2 FGA) / 6 AST / 6.9 REB - this is a result of mixing Kobe's best seasons for those categories
Vs.
27.6 PTS on 49% / 6.9 AST / 7.2 REB - this is literally what Lebron AVERAGES ACROSS HIS ENTIRE CAREER including his rookie seasons
Kobe's best AST and rebound seasons ever don't compare to Lebron's average over his entire career. Simply put, Lebron does more better and his godly athleticism make him a comparable scorer to Kobe. No, Kobe doesn't have Lebron's physical gifts but that can't be held against Lebron.
Lebron has more impact on
Both ends of the court.