Duncan has led the Spurs to 4 NBA Finals. I think you would have to say that Parker led them to this 5th finals. Duncan's career playoff stats are better than Kobe's. Duncan has two regular season MVPs, Kobe has 1.
When Duncan came into the league, David Robinson was on the downside of his career. When Kobe joined the Lakers, they had Shaq. Then they got Phil Jackson. Duncan in his prime never suffered an embarrassing finals beatdown like Kobe did against the Pistons or against the Celtics. When Duncan has reached the finals, he has always won. The Spurs' backcourt a lot of the 1999 title season was Avery Johnson and Mario Elie. When Kobe had Smush Parker as a backcourt mate, he did not win any titles. In the last two games of the 2003 Finals, Tony Parker was often replaced by Speedy Claxton, who was playing WAY better than Parker. (You read that correctly).
By contrast, one of Kobe's two titles as the main guy he went 6 for 24 in game 7 against the Celtics. He turned the ball over 4 times and had 2 assists. For that mighty effort, he was named finals MVP.
Tim Duncan has a better career PER. He has a better career playoff PER. He has more career Win Shares. He has more career playoff Win Shares. If you compare his Offensive Rating versus Defensive Rating, Duncan is +15 in regular season and +11 in playoffs. Kobe is +7 and +4. The great all-time playoff performers are almost all +10 or better. Duncan - yes; Kobe, no.
Statistically, it is a mismatch.
The thing that Kobe supporters cling to is he is a better scorer (true) and that he has 5 titles to Duncan's 4. Well, Kobe basically was a Pippen in titles 1-2-3; Shaq was finals MVP in all three titles, Kobe was "little brother" riding the big fella's coat tails. If you say - "led team to title" Duncan has 3 maybe 4 and Kobe has 1, maybe 2.
Sorry, Kobe fans. Duncan has just been a better overall player than your guy.