Lebron James has been to the finals 9 times, and won 3 of them, so that would be 33.33% success rate.
Kawhi Leonard has been to the finals 3 times (2 in San Antonio, and 1 in Toronto) and won 2 of them, so that is 66.67%
That's how good Leonard is.
Is that the basis that Kawhi is more good?
It's better to compare the winning championship stats if Leonard will also be in finals 9 times. Let's wait for more years.
Lebron is already known for carrying a whole team. Kawhi didn't experience that yet so maybe once he transfers to another team we can see how good his leadership is. He is not the team leader on Spurs, Raptors, and Clippers but just doing his role. Kawhi is still young and he can beat the hell out of records out there, not just against Lebron but to other superstars as well.